Alright for once and for all i have seen dozens of play chip threads on this site for both full tilt and
poker stars, and as i have quite a bit of experience in this category i will clear some things up.
A few years ago (when i was playing poker seriously) i thought it would be fun to see if i could freeroll with an account on FTP, and i had heard of a 500k $40 freeroll on FTP. It took me a few months to get the hang of things, but within a week i had cracked 100k and in the month 40M.
After falling to about 25M play chips i entered the freeroll and won $2, and after the tourney someone contacted me for selling play chips to him.
The deal went smooth and all, i got my money, until my account was banned for "underage
gambling."
Yes it is possible to sell your Play chips on many sites, there are both an odd amount of buyers and sellers, but be warned they are not all legitimate not all sites are trust worthy, and if your dealing on ftp you may get banned. Seriously.