I know. I use it all the time, mostly for metal & concrete textures, aswell as rock and some others.
It's too bad most of them aren't tillable.
Although, what most people don't realize, is that with just a bit of work, you can actually make some of the least tillable textures there tileable.
(see http://www.sketchucation.com/forums/scf/viewtopic.php?f=40&t=14465)