I opened an account on ioffer.com about a year ago, as an alternative to selling on eBay. It ranks amongst the worst decisions I ever made. First off, they will charge you $20 upfront to 'pay for
Your selling commissions' rather than pay-as-you-go like other sites. Good luck getting that back if you decide to close your account.
I found their site to be very ineffective, very few sales compared to other sites like eCrater, Bonanza and Webstore, and when I decided to close my account and get the remainder of my balance returned, I get no response from their customer service (You could call it customer service if they gave you any, so I guess I shouldn't call it that). I'm going to end up having to file a complaint with the BBB to get my lousy $10 back.
STAY AWAY!