Why is thunderblast so expensive

Hi transfans!
I aquired Cybertron Thunderblast through a collection I bought and I really disliked the figure. It is the pure definition of a shellformer to the point that I don't even see it as a transformer but rather a surprise figure inside a boat. It is easily one of the toy designs I like least along with Backstop.
So, I wonder, why are his prices so inflated online? I can't find a loose one under 50$. Was he rarer than the other cybertron releases?
I aquired Cybertron Thunderblast through a collection I bought and I really disliked the figure. It is the pure definition of a shellformer to the point that I don't even see it as a transformer but rather a surprise figure inside a boat. It is easily one of the toy designs I like least along with Backstop.
So, I wonder, why are his prices so inflated online? I can't find a loose one under 50$. Was he rarer than the other cybertron releases?