you will learn as you get more into the hobby that mixing species, and even more, inbreeding species is highly frowned upon. when i first got into dart frogs, that was one thing that was mentioned many many times. its important to keep these bloodlines pure. with alot of these species, we are very limited with what we have in the hobby... in other words, rare in the hobby. that is why there is a high price on alot of species and that is why some people are very selective as to who they sell to so only serious hobbyists will considder. people just want to make sure these animals are going to fall into the hands of someone who will do it right and keep the bloodlines fresh and secure the future of these beautiful creatures. as advice to newbies, dont take any of this stuff personal. these people know what they are talking about, so their advice is probably the best. take care!
-josh