I kept a screenshot of each purchase and there is a pattern.
At first I didn't really know what I was doing, buying all the wrong weights and plastics.
Then I got into stats and tried to find discs that would be comfortable to hold. This led to some very random purchases, most of which never made the bag.
Then the experimental phase where I tried to find discs with weights and flight characteristics that I would manage and might expand my game. More mainstream moulds, but only a few that would make the bag.
Then the putter phase where I tried to find my perfect putter.
Then the must-have-multiple-putters phase, which led to me owning 5 of a couple of candidates.
Then after losing a couple of discs in two days, the knee-jerk must-have-backups phase which was very expensive, but at least based on some knowledge of my current bag.