The first thing I do is before even buying I make sure I have photos that I can use with the kit. Normally, when I take photos I have enough to scrap a few pages worth from one event, so I scrap those using only that kit. I actually remember when I first started digi scrapping full time I used the same halloween kit 3 years in a row before I decided I needed a new one (and even now I still grab and use stuff from that original kit lol). If I purchase kits knowing what photos I want to use with it but I can't scrap with it right away I make sure I write it down (I have a notebook with everything written down AND I use Evernote where I can put the photos and the kit preview together for future reference).
I would be a kit hoarder if I could afford it.... I actually had to walk away for a while because I was bummed out that I couldn't purchase new kits that were perfect for new photos I had taken and it was getting depressing...... I am so HAPPY to be getting back into things, and enjoying being inspired by new stuff again.