I can totally see where you are coming from. Ever since I've been in the horse world I've always had the raggedy lesson/lease horses; the unpapered grade horses (who were nice and some of my best but would never get me any where competitively) and my fair share of people who got whatever they wanted and were never satisfied. I work with a top notch trainer who has the 30,000 - 65,000 horses come through her barn, we've had clients buy them and sell them and meanwhile we both are stuck with the 'lesser' prospects. In fact it's only recently that I've gotten the opportunity to own my first 'nice' (meaning pedigreed, papered and top notch conformation) colt. (Then again I think all of my horses are beautiful and great and better than any other horses
Any how, my trainer told me this: "Those people may have the expensive, papered and 'great' horses but we have the horses who teach us how to ride." She had a point. One of her 'meat horses' (not the expensive 'great horse variety') went to worlds last year and won his class. My point is that sometimes the best horses are right in front of you. In the end those 'raggedy' horses will teach you more than any of those other horses will; they'll teach you how to sit a buck, rear and roll back in the middle of your park class or the horse attempting airs above grounds in a reining class.
I've said it before and I'll say it again: It's the rider that makes the horse. Keep your chin up and don't hold it against them! (They can't help it our $500 horses are better!