The Jaguar trait is a simple co-dominant trait as far as I'm concerned. There are a lot of variations (hypo, red hypo, etc.) of the Jaguar that have been produced, but none of them have ever proven to be "genetic", at least not co-dom or simple recessive.
As Matt Brock stated, all Jaguars started with a Coastal Jaguar...which is why they're commonly referred to as "Jaguar crosses."
As far as the "market" goes, that just depends on what you put into it. This is not printing money...you have to do some work like advertising, taking good photos and building a good reputation if you want people to readily send you thousands of dollars for your animals. That's not just with Carpets, but with anything.
If you're just going to sit back and hope your Jaguars sell because they're Jaguars, don't buy one to make money because those days are long gone. Nobody just wants a Jaguar for the sake of having a Jaguar...they want a good looking one! If you start with a quality Jag, breed it to other good looking animals (morph or normal), take good/clear photos and do a little advertising so people know who you are, you'll probably do great with them. If you aren't going to do those things, you probably shouldn't expect to do well selling any type of reptile in that price range.
All that being said, the best thing I can tell you is this...
Don't slack on your normals because they can make or break a clutch of Jaguars in terms of quality. That's why it helps to genuinely have a passion for Carpets.If you get a Jaguar, I'd suggest that you really get into Carpets and start thinking about what amazing Carpet you're going breed your Jaguar to when the time comes. Many people make the mistake of putting a Jaguar in with any old $100 female Carpet, then they hatch out a boatload of fugly Jags and then wonder why their Jags aren't selling. 
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Anthony Caponetto
www.ACreptiles.com