You should look at the External Funds thing mentioned in the article. It gives a different spending breakdown than Purchase History.

Help > Steam support > My account > Data related to your Steam account > External funds used. (Its the 13th item on a huge page full of stuff.)

Invest!

Your profile page will say your account birthday. Float your mouse over “Years of Service”.

Meh. You were late to the party. Musta got Steam to play Half Life Episode Two or Portal.

I got Steam so I could play Half Life 2 when it was released. May 4, 2006. 153 games. $1,725 spent.

This thing about not owning the games … um … Steam is a more reliable, stable, all around better repository for my games than any device I’ve ever owned. Other than the Ubisoft games that are designed to not be re-usable (never buy Ubi again) I have access to every game I’ve bothered to spend money on for the last two decades.