Selling PC games through PPC advertising

I found an affiliate program, it is selling a subscription for an MMORPG.
I would like to know what is the conversion rate when selling such a product through PPC,
in other words if I get 100 clicks from Adwords, what percentage of it would convert to sales?
I would like to hear from people who had experience with similar ventures.
Thank you.

See original post by dalebu