I was never a proponent of hybrids until I started realizing that many of these fish I love to keep are already hybrids.
I think for me the originality and uniqueness of hybrids are the allure.
Take ob zebras, a natural occurring fish in the wild is theorized to have breed with an aulonocara species and thats how we have ob peacocks (very general and just my understanding of it) that are stunners and wanted by a lot if African cichlid keepers.
The ob gene is sought after by a lot and now there are crossbreeds of many Africans strains and beautiful and sought after.
The albino gene is another.
I think (my opinion) based on your question of why hybrids, is that for many (myself included) keep fish that are unique can almost be equated to keeping "rare" fish.
The feeling of taking care of fish that "nobody" else has is exciting for me.
That is a funny fact indeed. But here in sweden malawihybrids are mutts and if you happen to breed an hybrid between lets say an crabro and an red zebra you will get **** from people thats only keeping malawis and linebreeds for genetics and other stuff. They gets in to lynching mode.
Been there done that.