I love buying kits!! at one point I have 4 (or 5) coming to my house a month!! I was in heaven!!!
But now i only get 1 ... The Scrap Room and I love it! It is really easy to use this kit up because it is divided into 4 collections with minimal embellishments (for each collection). So after creating a page or two from each collection, there is not much to add to my stash. However, if there is... I do add it to my stash.
I also put my own kits together. It makes my scrap time more usable. The times where I am not scrapping (mostly just watching TV lol) i will get my pictures, papers and embellishments and put them together in a plastic bag and then when I am ready to sit and scrap, I have my stuff ready! I do this for Crops too! Works great!