I was in that same place a couple of years ago, and I decided I had way too much stuff that I actually LIKED to keep collecting and not using, so I made a written list of my unused kits and started crossing them off as I used them (I LOVE crossing things off a list!). I also deleted old stuff that didn't make me happy.
I also write down my purchases so that i can stick to my budget; $30 goes REALLY faster than it actually FEELS like it's going, lol, so writing it down makes me ask myself, "Do I want this badly enough to do without something else later this month?" Then I can still check off my new purchases as I use them.
I have 7 unused kits from this year AND last year that I still need to use. Considering that when I started keeping track a couple of years ago, I had 54, I feel pretty good about seven!