I don't see the point of props, anyway. I don't think I'd care if they weren't free. Besides, what do te even mean da free? They aren't "free" now, because someone else still has to actually give them to you.
Props will never have to cost money. It could result in violence, and in extreme cases, even lawsuits. Not a good idea to bring money into something like this. Plus, richer people, o people willing to spend più money might feel that they shouldn't be giving props to people who won't give back, i.e. people with little o no props, thus creating social classes on Fanpop, which is one of the things many people unisciti fanpop to temporarily escape from. I know that if te props started costing money, I would protest against it, and if that didn't work, I would quit.