'Oh god': There's a buried Steam help page that shows how much money you've ever spent on the platform, and you may not want to know

$187 / 2 years

Im happy with this, especially since all the games I have bought, I actually really like. So I have all the bethesda game studio games (literally), ESO, Doom, Cyberpunk, Witcher 3, Baldurs Gate, Assassin's Creed: Odyssey, Batman Arkham Night, Injustice2, and No Man's Sky (the only one I regret buying).

I think all these games are worth those $187. I have only bought a copy of Skyrim outside of steam (GOG) otherwise it's all on steam.