[mashabox]

If it is full on Fridays then it is needed.
Just think of these Muslims who are not getting permission to build mosques.
If you feel some has invested too much in the mosque then just try to have the husn ad-dhann that he must have paid his Zakaat in full.
Also assume that he has paid enough to feed the poor and the needy. Just assume that there are too many poor and needy to be fed by him and he really wanted a beautiful mosque.

And it might be a sign of the end times. If this is the case then our first worry should be about our own future. In deed without signs of end times we should worry about ourselves but this approach where allowed actions of other people are questioned is not a positive one. Our own actions themselves leave so much to be desired.