I think from a business standpoint you probably want to breed most of your snakes as low end cheaper snakes. I just saw a video from a big breeder and he said that the majority of the snakes he breeds are corn snakes, and they are cheap. The demand is higher for a cheap snake. Anything above $300 and you are probably targeting possible breeders instead of your typical pet store hobbyist. I've seen people breed high end snakes and they seem to sell pretty slowly, not many people can whip out thousands of dollars to buy a snake. And in most cases it's an investment breeder making the purchase, not the general public.
With that said I'd say to purchase and breed what you really like. If they don't sell you can add them to your collection and sit on them until they do sell or perhaps you may want to keep them. Personally I have a mix of high end and low end snakes, from $50 up to about $1200. I'm planning on breeding and selling at shows, so when someone walks up to my table I'll can reach the largest variety of customers (big snakes, little snakes, cheap snakes, expensive snakes, colorful snakes, drab snakes, active snakes, lethargic snakes, etc..). If you have a few of each kind you'll get the most people coming to the table, especially if you have just one or two of a kind that most people don't have (like the Australian Woma pythons for example).
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