Seriously though, what is a registry for (unless you are breeding or breed showing)?
For an established association like the AQHA or the AHA, it's all about producing consistent
breed type, as well as improvement of the breed.
These fly-by-night organizations do nothing but take your money and give you a pretty piece of paper so you can say your horse is registered. Which
organization registers the animal is what makes it a big deal or not. For established, recognized breed organizations, they won't accept just any old horse with unknown bloodlines. The crappy ones will take anything.
If you have a grade cross, you have a grade cross. If you wanted something with papers that actually mean
something, you should have bought a horse from an established breeder.
Trying to get something registered after the fact is all about vanity for the owner, as far as I'm concerned.