The pH should be just fine .

Fancy domestic Livebearers don't carry the same stigma as hybrid cichlids.  You'll run across the occasional purity snob but most of them just need something to feel superior about...LOL.  Others may choose not to keep fancy domestic Livebearers, but they have no problem with other people who do.  Personally, I love the challenge of line improvement and the opportunity to learn more about genetics, so I find keeping both fancy domestics and wild-types provides a more complete experience.

The most important thing to remember is to identify any fish as a hybrid if that's what it is.  Fancy Mollies, Platy's & Swordtails have been around almost as long as the hobby itself so most people don't ID them as hybrids, but it can't hurt to do so.  The biggest problem I've seen with them is people automatically identifying a sailfin as 'Velifera' or shortfin as 'Sphenops', etc., which should be reserved for pure species unless disclosing a cross of known heritage, such as 'P. sphenops x P. velifera hybrid' or whatever. 

Stores are usually interested in them because they're colorful, but you'll have to grow them out to saleable size.  Hobbyists are often interested in healthy homebred stock as well.