Even way back in Adventures of Sonic the Hedgehog, Eggman was described as "the sexiest fat man alive".

If he has that big that dick why is he wasting his time trying to kill Sonic?
The man owns a literal ocean of oil so he's among the richest men on the planet( how else do you think he pays for all his robot parts?), he's arguably the smartest man alive so he could just solve all the worlds problems and become a bigger hero then Sonic could ever be, and he actually seems like a rather nice guy when he's not trying to take over the world and as mentioned before he's got a big dick. If he stopped tying to kill sonic he could be living the high life surrounded by beautiful women.