I am ready to pay 'minimal' fee for selling my items but then again if you charge a little too much no one's going to sell at the site. The fee should be charged on the basis of what the thing is worth. Used products and New products should also be considered etc. etc.
The idea of making the Donation compulsory is stupid IMO, it shall take away that special edge that PG has, Donations on the other hand are a very good option, Give us a thread telling the cost of PG and I am pretty sure many people are going to chip in including me. I do think everyone can spare 200-300 rupees from their MONTHLY pocket money/salary, We spend more than that everyday on AYASHI.
VIP Member stuff is another option too
-Khawaja