If you really want to play Genesis titles on your PC and you want to give SEGA a nod that you appreciate them putting them up on Steam for sale, you can do that on the super cheap. You get over 40 games!
The package includes classics like Streets of Rage 2, Vectorman and Ristar. Cult games like Wonder Boy III: Monster Lair and Alien Solider. The package will normally run you $112.60, but $9.99 is a better price.