Last year, I made a resolution to shop less. This year, I realized that I don't shop anymore. I got to the point where I looked at the new kits and I thought, "I've already got something a lot like that," and I didn't buy it. Then I stopped looking.
I'm not saying that I've got the worlds most complete stash. Far from it. But I've gotten enough of the classic kits that I prefer to work with and I've learned enough about Photoshop that I don't need to buy anything more to create a layout that is pleasing to me.
I create because I need to do things that please me.