People like hybrids for similar reasons that people like specific morphs or specific species. It's about looks, size, shape, personality.. Why do you like kingpin ball pythons?(for example.. not really sure what you're into specifically!) Or albino burms?
I think that the ball x burm hybrid is just about one of the most gorgeous snakes out there. I'm a little less fond of carpet x ball hybrids. The F2 superballs are pretty darn outstanding.
I'm still waiting for the SD retic x ball attempt. IMO that has potential for great colors on top of incredible patterning, all in a snake of manageable size with a fantastic appetite.
Of course my fav. hybrid I've ever seen pics of is the gaboon x rhino viper hybrid.. dear god it's beautiful.