History of my preorders or full purchases:
Full price purchase:
L4D+L4D2
Diablo 3 - Probably the only culprit here. But cmon, Blizzard was good at that time.
It Takes Two
Binding of Isaac Rebirth
PUBG
Psychonauts 2
Preorders:
Portal 2
The rest is just acquiring good games for low price. Especially humble bundle (that specific one was extremely juicy IYKYK)