I would love to be able to look at it like this, and I do hope that down the road I feel comfortable adding a desert project. Right now, I just don't trust that the females I produced would remain pets, and not bred due to ignorance or "just to see what happens."
I'm certainly not of a mind that every single ball python produced into this world has to be bred -- far from it -- I think it would be great to advance and encourage the notion that "pet only" is a fun and perfectly valid way to enjoy ball python morphs. Moreover, I could even try to take your argument one step further and posit that the infertility of females could eventually be a good thing for the project, keeping numbers down as only 1/4 of all offspring from a desert breeding would be breed-able deserts.
I just ... Don't know how things are going to pan out yet.