Bettas are gorgeous, amazing fishies... I don't think any of us will argue that. But, the truth is that the MAJORITY of Wal*Marts treat their Bettas horribly, and in the end when you buy fish from them you support that treatment. It is awesome to rescue them, and they all make wonderful pets.. but do I think they're high breeding quality? No.
It's a lot like the pet store puppy arguement... it isn't the puppies's faults, its the horrible mills that breed them and the pet stores that capitolize on their suffering to make a profit.
Also... about the "New Moon" issue. Didn't you recently buy a male from WM that was labeled as a 'New Moon', but you actually found out he was a Delta? New Moon sounds like a name that sellers give them to make them sound more rare and flashy.