A leopard clown with a kink for $900 isn't unreasonable to me. It's still a unique animal to add to a collection, and therefore can carry a high price tag. It kind of depends if it's worth that much to YOU or not. I'd pay $900 for a leopard clown with a kink and never breed it and love it for all the world for it's uniqueness.
I collected quite a few kinked/deformed animals back in college and slightly afterward. Its rewarding to give them good homes and watch them prosper. It can also be heartbreaking as some of them may never prosper fully...
https://ball-pythons.net/forums/show...ighlight=kinky
This was a thread a long time ago about a boa I had named Kinkers. She ate fine when I acquired her, and was friendly as could be, but one day she just stopped eating. It was terrible to lose her, and I stopped keeping snakes for awhile. I think I paid $100 for her and I never regret it. She was beautiful.