I organized this morning and tagged previews and it's kind of scary how many have not been used yet. However, looking at them, I've found a couple of patterns:
1) Notoriously bad about not using collaboration kits, same goes for the FWP
2) I've also stopped downloading the freebies because I don't tend to scrap with them
3) I really need to stay away from other shops. I've got some gorgeous kits, but when you can't use them for challenges, they sit.
4) A lot of kits bought to scraplift a specific layout but I don't have pictures for (yet). One of these days I'll get around to posing my kids just so I can finally do that scraplift.
5) I would feel a lot worse if everything weren't purchased during sales or Sweet Rewards.