Cabal isn't worth much either... they usually sell around $20. the Ajax might be worth a bit more to someone who collects shooters.
the only board there that could be of real value would be SFII, but as the previous poster said, how much would depend on what version.
assume shipping to be about $25, which'd put each of the 5 boards at $20. if they're all working and are games you're interested in then it's not a terrible deal. if you're looking to buy to resell probably not a good deal.