I wouldnt go as far as flowerhorns...the market for flowerhorn is a niche, ..kinda like the arows, pcbass, and discus... .... Not saying that FH's arent nice, and that they wont make you money... just saying that its a harder market FH then your basic fishes that even newbies can ID....
...Hmmm, well, if you are TRULY serious then you will go Flowerhorns.
1. Expensive - ...meaning profit, but it is important to breed them yourself (if any losses occur, its OK, you bred them). Being Cichlids, they will act like the beasts they are. And I find that Flowerhorn lovers will pay for stunning fishes, including me.
2. Horny - ...luckily these fishes knows whats up, unfortunately they are also vicious killers
3. Hardy - ...they are tougher than the average bear, I mean EBJD
4. Market - ...these guys are international, and NO, you don't have to buy from the Motherland...Made in USA are masterpieces too.