Sex sells much better in this industry.
However, Eva succeeded because their work was a healthy mix of romance and porn. Characters and stereotypes, plot and porn.
Let's not get ahead of ourselves. Haven't you seen other games here?
Cocky alpha assholes like Axel and Mike are great to have in the game, the corruption aspect is one of the core aspects of these games. But if these types are balanced with some nice, comforting, reasonable nice guys, its a much better end product, just how in GGGB you had some wholesome routes. And even their alpha Jack had some depth and possible redemption, while in ORS, Axels content got cut and he is an irredeemable villain.