Selective breeding is not only about starting off with quality animals. It is also about taking whatever you have, and making it better. One absolutely could start off with a low quality pastel, and by pairing it with nice light normals and holding back the best hatchlings, get some much better pastels within a few generations.
I don't quite get the desire to purposely start out with low quality, though. Although, I can see that it would be very fulfilling to reach the point where you have some very very nice pastels just by starting with a single low quality male and doing selective breeding from there.
Start with single genes? Yes, I can see that, too. It is a lot harder to know what quality of pastel you have when it is a 3 gene snake than a single gene, so there is at least some sense to it.
I wouldn't recommend this path. You won't make money, nor probably even break even, and you might have a lot of trouble selling off your extras, though. But if it is what you want, if it is what excites you, then I say go for it.
But, consider whether or not THIS snake is the right choice. There are all sorts of red flags in the info you have posted. My biggest concern is whether or not this snake is healthy. Please, if you decide to go through with this, look it over very carefully before finalizing the purchase.
Good luck!
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