I just checked, and it doesn't appear that they are accepting the 2008 or 2009 smackdown vs. raw ps3 games; probably due to the fact that they are sports related titles which are dated each year they're released. Every year that passes, the previous year's release drops in value greatly.
From what I saw, they are still taking 2010's release but are only offering $4.60 trade-in credit for it. Even if they did offer a trade-in for the '09 edition, it would probably cost more to mail it than it actually net you any sort of profit.