Probably because it's a male, which can still breed successfully even if kinked, and especially if the kink is due to an incubation rather than a genetic problem. And yes, there are people who would take a kinked snake and breed it if it were a high-$ morph otherwise.
I have a kinked BRB that I produced that I haven't rehomed (yet). I'm not averse to the idea but I also am waiting for the "right" person to come along. Since I produced him I feel responsible for where he ultimately ends up. The new owner would have to sign a contract stating that I get the snake back if he can't keep it any more.
Otherwise, you're not likely to find kinked critters at an expo unless the vendor can't fill up the space on his table with healthy, breedable stock. If you're looking to purchase imperfect critters that can still have a decent quality of life as pets I'd suggest writing something up introducing yourself, what you're looking for, and why. Then make copies and hand them out to vendors.