Well, I think LeeAndra wins this one!
A couple years after I started scrapping, I counted up how much I was spending per month, and it was a sobering experience. So now I keep an "Unused Kit" folder, and I keep my newest downloads in my downloads folder. When I want to scrap, I check those two places first to see if I have a kit that works. Doing this has really helped me see what kind of kits I actually want to scrap with as opposed to just wanting to collect because they're so pretty.
I only have half a dozen kits I've bought and not used, but this is the one that is sort of sacred: I want to use it because it's so perfect, but I'm not sure I'm good enough to scrap with it. ; )
