They recommend you the "guaranteed" add-on which apparently gets you more designers, but it only gets you more slackers which want a lottery ticket for the prize without putting in any effort.
You're way better off to look for a local designer and work with them on a design. It will cost you even less and you'll end with what you want and not the $#*! those so-called designers on that page will produce in their 5 minutes of contribution.
You have no control over their "designers" efforts and can't do anything about it. Not a place to look for quality.
You'll end up with $#*!.