I have tried selling parts on forums before, and had way too many issues with buyers, payments, addresses, haggling, lowballing etc.  And certain folks that want to call my cell number all hours of the day to ask questions about anythind and everything.  There were a lot great people to deal with and some that were not.  I know that the forums are a great spot for the die hards that bleed blue and red, however ebay provides a platform that streamlines the entire process, and I do not mind the fees because of that.