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This may be because the hadith in question is considered (very) weak that is why some prefer not to act upon it.

Shaykh al-Islam Abu Zakariyya al-Nawawi (rad.ia-LLahu `anhu) said in the 'Adhkar':

"The ulama among the experts in hadith and the experts in law and others have said: it is permissible and (also) recommended that the religious practice (al-`amal) concerning good deeds and good character (al-fadâ'il), encouragement to good and discouragement from evil (al-targhib wa al-tarhib) be based (even) on weak hadith (bi al-hadith al- da`îf) as long as it is not forged (mawdu`).

As for legal rulings (ahkâm) such as what is permitted and what is forbidden, or the modalities of trade, marriage, divorce and other than that: one's practice is not based upon anything other than sound (sahih) or fair (hasan) hadith, except as a precaution in some matter related to one of the above, for example, if a weak hadith was cited about the reprehensibility (karahat) of certain kinds of sales or marriages. In such cases what is recommended (al-mustahabb) is to avoid such sales and marriages, but it is not obligatory (la yajib)."

Ibn Hazm has similarly mentioned that all Hanafi scholars unanimously agree that the school of Abu Hanifah (rad.ia-LLahu `anhu) holds that weak hadith is preferable to opinion (ra'y) and analogy (qiyâs).

The majority of the scholars (al-jumhur) hold that it can be used as basis for practicing good deeds and achieving good character (yu`malu bihi fi al-fadâ'il) but not for legal rulings (dûna al-ahkâm). And God is the Granter of success.

I recapitulate the list of hadith masters who accept the use of hadeeth da`îf at the very least for religious practice related to ethics (fada'il al-a`mal) and in some cases even for legal rulings (Ahmad, Abu Dawud, and the entire Hanafi school), according to the above three sources (Sakhawi, Ibrahim, Keller):

1- Nawawi
2- Ibn al-Salah
3- Sufyan al-Thawri
4- Ahmad Ibn Hanbal
5- Ibn `Uyaynah
6- Ibn al-Mubarak
7- Ibn Mahdi
8- Ibn Ma`een (forgery specialist)
9- al-Khatib al-Baghdadi in 'al-Kifayah', chapter entitled:
"strictness with regard to ahadith pertaining to rulings
and leniency with regard to those pertaining to virtuous actions"
10- Bukhari as proven by his use of them in 'al-Adab al- mufrad'
11- Ali al-Qari (forgery specialist)
12- Ibn Hajar al-Asqalani.
13- Ibn Abd al-Barr in 'al-Isaba'.
14- Ibn al-Qayyim in 'I`lam al-muwaqqi`een'.
15- Sakhawi
16- Abu Sa`eed al-`Ala'i (forgery specialist).
17- Abu Dawud.
18- Hanafi school.

Ibn Taymiyya said in his book "al-qaida al-jaleela fit- tawwasuli wal-waseela", with commentary of Dr. Rabi'a bin Hadi 'Umayr al-Mudkhali, professor in the Islamic University of Madinah al-Munawwara, Page 162, para 478:

"But Ahmad ibn Hanbal and other scholars permitted the narration [of hadith] regarding the virtues of good what is not established [as authentic] as long as it is not known that it is a lie." (laakinna Ahmad ibn Hanbal wa ghayruh min al-'ulama jawwazu an yurwa fee fada'il al-'aamal maa lam yu'lam annahu thaabit idha lam yu'lam annahu kadhib.)

And Ibn Taymiyya goes into a full chapter of discussion of this subject from here, Chapter 8 of "al-qaida al-jaleela fit-tawwasuli wal-waseela", where he presents the views of the majority of the 'ulama of Islam and he presents his own views of the subject. And here we will examine this in detail.

To continue, Ibn Taymiyya says, in para 478:
"and that is the action which is known to be lawful with a shari'ah evidence, and there has been narrated in its virtue a hadith that is not known to be a lie, it is possible that the reward will be true, although none of the Imams have said that it is permissible to consider something required (wâjib) or recommended (mustahabb) by way of a weak hadith, and whoever said so differed from the consensus (ijmâ')."

So here we see that Ibn Taymiyya is explaining that if there is a hadith, even though it has not been judged to be authentic, if it encourages what is known as a good deed in Islamic shari'ah, something of virtue, a praiseworthy action, or idea, then it is fully acceptable to refer to such a hadith as an encouragement for that deed.

And here also, Ibn Taymiyya refers to the ijma', the consensus, which is a clear reference to the concept of ijma' of scholars of Islam as being a fully accepted concept and one which *he* accepts. And this is a clear proof that Ibn Taymiyya, though he considered himself a mujtahid mutlaq, capable of independent reasoning, nevertheless depended on the consensus (ijmâ') of scholars as a proof for the opinions he considered acceptable. And this is the position of Ahl as-Sunnah wal-Jama'at.

Then Ibn Taymiyya continues in para 479:

"And just like it is not permissible to forbid something without a shari'ah evidence, (dalîl shar'î) but if it something is known to be forbidden and a hadith has been narrated in warning the one who commits such an action, and it is not known that it is a lie, it is permissible to narrate it. And it is permissible to narrate it in the manner of encouraging and discouraging (at- tarhîb wat-targhîb) what is not known that it is a lie. but in what is known that Allah has encouraged or discouraged with another evidence besides this [weak] hadith whose authenticity is unknown (majhûl hâluh)."

So from this we see that Ibn Taymiyya is using the weak hadith (ahadîth da'îf), to discourage people from doing an evil deed, as long as this deed is known to be forbidden in the shari'ah. If the deed is forbidden in the shari'ah, it is acceptable to use a hadith whose authenticity is unknown, as long as the hadith is known not to have been an actual lie. This principle is acceptable, in anything that it is known that Allah expressed its forbiddance.

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Source:http://www.livingislam.org/n/vwh_e.html