I have a pintaloosa, she is the best mare I have ever owned. I don't think color of any kind predicts temperment or ability. I got her as a filly b/c she showed a lot of potential w respect to jumping which is what my daughter wanted to do and I liked her. She, of course, is grade. I have never noticed anyone thumb there nose at her, and one would have to be pretty ignorant to not deduce she is grade. In fact, when I would take her to the hunter jumper stable my daughter trained at, teenage kids w their own horses would ask if they could ride/jump her - go figure. I know when I was a teenager I did not ask to ride other people's horses - I rather liked my own. My daughter has since quit horses all together, I gladly took her, and the filly (now a mare) is also one heck of a mountain horse.
She was my first grade horse. I personally would not breed a grade horse w/o a very
specific and thought out reason in mind. It sounds like you had such a reason. Registration is just a "collective effort" to selectively breed for "x" characteristics/abilities. It really doesn't matter unless a show you want to attend is exclusive, and, more importantly, to marketability. I tend to keep my horses for their entire life, most do not. So, marketability is of extreme importance "in general". A grade horse has to "prove itself" on an individual basis before the demand for it is as great as an unproven younster w proven bloodlines. It's the human factor. Look at mustangs, many of them are inbred (just like registered horses
), and there is a high demand for them on the basis they are/were "mustangs".
If one cares for a horse for its entire life, I don't see what it matters what their particular breeding program is - otherwise, yes - I see a problem w it w respect to the horse's future prospects.