It varies for me. I have seen kits where I just fell in love with them and thought I could scrounge up pics to fit them. However, some of those buys are still sitting unused on my hard drive. Most of the time I look for kits to go well with the photos that reside in my ever-growing "To Be Scrapped" folder. I've heard a lot of people say they will only use a kit one time. I think for me it depends on the kit. I have some kits that have such a variety of papers & elements that I might use them for several layouts. Then again, I have some that I've only used once & probably will not use that kit again. I might use a paper or element with another kit though. Ok, this is running on....so I'll shut up now.
"The greatest treasures are those invisible to the eye but found by the heart." Author Unknown