Ask HN: Am I the only one thinking that CodeCanyon's rates are unfair?

I never used CodeCanyon before, so I was browsing their site, and looked at their payment rates.

http://codecanyon.net/make_money/payment_rates

They take 50% of each sale if you are an exclusive author (but they lower this rate as your sale volume increases) and 67% for non-exclusives author.

I always thought that Google and Apple market's rates were high (30% of each app sale, if I remember correctly), but they did a huge work builting an entire ecosystem of mobile devices, so that sounds fair to me.

But 67%! It's really bugging me. What service do they provide is worth so much? Does anybody already used CodeCanyon successfuly?