So for people stating that these are "out of this world interest rates", they are not compounded, they are flat. The point of these is that that are more straight forward and you don't need to calculate them, you just pay back the amount plus a set percentage added on. In the likes of Emerald, the interest is compounded (I believe, correct me if I'm wrong) so the amount you owe increase from the moment you borrow. In this case the amount you pay is 10/9/8/7.5% and doesn't increase the longer you have it out.
So these are not uniformly "more expensive".
(If Emerald does do flat rates then ignore this, it's wrong and the interest would be better off being lowered to like 5.99%)