Ask HN: Are there any premium Rails template providers?

There are quite a few people / companies that sell premium Wordpress templates. From what I understand, some of them do quite well.

I was hoping to find something similar for Ruby on Rails templates. I know that there wouldn't be the same kind of drop-in ease of use, but for us developers who are somewhat design challenged, it would be really nice to just start with something that we can modify.

Unfortunately, I am not finding any place to buy such a thing.

Do any exist? If not, why? Seems like a hole in the market to me.