This is true for me as well. I'm going to guess 95% or more of my steam games come from bundles. I have only bought a few games on steam itself. Similar situation with GOG, where a large majority of my games have been bought on 80-95% off sales. Just in case the itch strikes...
I used to buy games that devs talked about on reddit's game dev subs. No intent to play them. I'd just pick 'em up to help the dev if I liked them or their style.