A lot of serious people who breed hybrids do it for giggles. A lot of them do it for the same reason people dinker with odd looking snakes, to see if something interesting comes out from this cross. I do agree some people do breed animal "A" with animal "B" just for the heck of it but a lot of people carefully pick what species or even certain animals from a species witha sertain trait they want to cross, what look they are going for, temperment, and what colors and pattern they want. And once someone find a cross that looks nice other people like it and try to produce more of them. Its a lot more like breeding for morphs than people think.