It isn't really a matter of how profitable the business is, but rather how much the labor is worth. To use a facile example, if you have a guy at your restaurant that cleans the bathrooms once per day, and you pay him $7.00 per hour, you might be happy with that. Now, if another guy walks in and wants to do that job as well and earn $7.00 per hour, you would have no use for him. You probably couldn't use him for minimum wage, either. But, if the guy said he'd work for a nickel per hour (and you put aside any moral reservations about paying that amount), you'd probably say "sure, what the hell, grab a mop."