My Steam account is already 17 years old, next year he'll be able to vote. The account has nearly 600 games, so it isn't surprising that I spent thousands on that. In fact, I was surprised that if I divided the spending by the number of games, I came out at below $20 per game. Then I realized that this is because the page only lists the money given directly to Steam. For example, at some point in time I was subscribed to the Humble Monthly Bundle, so my money did go to them and not Steam, but it added lots of games to my library via Steam keys.

I don't own any of the games in my Steam library, legally speaking. I have a license to play them. And given that I am already in retirement, it has to be pointed out that this license ends with my death. Accounts are non-transferable, even via a will. That is why that help page is careful in describing this as "money spent", not "value". While there are websites that let you estimate the "value" of your steam library, that number is questionable. If you bought a game a few years ago on release, played it for 100 hours, and really don't want to play it again, what is its value? Anything between priceless memory and worthless. The same is probably true for the totality of your Steam account, it is valuable as both a memory and as an opportunity to play the games in it, but not something of legal commercial value.

In the end, that help page is only surprising in the fact that it exists, not in the fact that over many years you probably spent a lot of money on Steam. If you could get similar information from your local supermarket, or Starbucks, you'd be surprised how much money you spent there over a decade or more. I am always trying to get at least 1 hour of entertainment out of any dollar spent on Steam or on other video games. The fact that this is still possible makes video games rather cheap, compared with other forms of entertainment.