what is everyones opinion on this if the hybrid frogs are not let out into the hobby and kept by the breeder themself?
I think it is a very bad idea to even produce hybrids because too many things can happen that allow the hybrids to accidentally get out into the hobby. You can't always tell a hybrid just by looking at it and even if YOU can, many others can't. So a hybrid could get mistakenly mixed up with pure animals. Also, what happens if you have to quit the hobby and get rid of the frogs? You could die, get sick, have financial problems, etc. and will the person who acquires these animals later know that they are hybrids? I've seen stuff like this happen before so I stick to my opinion that even producing them for your own "personal" collection is still asking for trouble.