We raised "traditional" Siamese for awhile. I had mostly seal points, but we did have a few blue points, a couple chocolate points, and a lilac point or two. Oddly seal points were the most popular and usually the first kittens to find homes. Breeding cats is a lot of trouble. Specifically keeping an intact male cat. It is rare to have an intact, actively breeding male who does not spray, and really hard to keeping a spraying male cat in the house. We had stud cages outside, so our boys ended up not really being pets at all. Not feral, but not particularly friendly either.
As far as prices go, I would rather buy Siamese than Sphynx. The breed I really wanted to raise. Those suckers are E-X-P-E-N-S-I-V-E. And I am not sure how we would work out keeping an intact male Sphynx in the house since there is no way they could live outside between the risk of sunburns in the summer and freezing in the winter.
I guess the other option would be to get a female with breeding rights and find a stud. We did occasionally stud out our male cats to other owners. Depending on the breeder, some will sell breeding rights for just a little more than standard kitten price. Though I can tell you, if you raise a litter correctly, you won't be making much profit towards recouping the cost of the initial kitty. Between all of the vet costs of preparing the kittens for their new homes (shots, wormings, health checks, etc.) and the prenatal care of momma (x-rays and sonograms to check the kittens progress as well as health testing before breeding her) it adds up very quickly. I would say we may have "made" $100-150 per kitten not including money spent on food and time off work to be there when momma was due to deliver. If for some reason we have to get momma to the vet for a c-section we lost money on the litter. That is with owning our male cats too of course. Outside studs typically run at about the cost of a kitten from the litter...or some people will trade for pick of the litter occasionally. When we did rarely use stud cats from other cattery's, cost usually ran between $500-750.
I would not say most (good) breeders sell their kittens with a spay/neuter contract do it so they can make money off you down the road...because there is not much money to be made. I know with the way we raised our cats I definitely could not make a living off it. I think the only people really MAKING money are the mill type breeders that do not put a lot of money into it.