Fencer.. I do not think there are many who would object to you running this more on a commercial basis, as long as the paying customer came first. It is your choice to run this how you will, but I firmly believe that the labourer is worthy of his hire, and that it should be possible without changing the site flavour to much.
I respect your right to give your time and effort for free but would rather see you garner the rewards rather than those who take advantage of your generosity.