I voted no for two reasons.
1 - As already mentioned above, the ability NOT to test the CC beforehand. There would definitely be a lot of crap CC's around.
2 - Long run support. What happens if the developer of a specific CC i have paid for, just vanishes? If i pay, i want support and constant updates. I have seen already in the free ones, that a lot of CC just get 1 or 2 updates and then they are dead. Yes, maybe the solution here is to be paid, so the developer is interested in updating it, because he is getting paid for it. But still, what if he just vanishes or people ask money for every crap CC/Plug-IN/Profile out there? Would kill the community and the bot.
People would pay 25/80? for the bot (Which isnt cheap, but a reasonable price) and just have out-dated profiles or the 1-10 profiles. The very basic CC which dont work all that good in PvP and the list goes on . . .
But!
I would pay for a CC that the developer stays around for the long run, the price is FAIR, updates it often, LISTEN to the supporters, implement new features without asking for more, etc . . .