Considering I have 827 games on Steam, the figure of $1620.26 doesn't seem too bad. Now I've probably bought a load more bundles bumping that up, but there's no convenient way to figure out how much that adds (let's round to $2000). I've had the account 18 years, 9 months.

So that's... $8.89 per month.

Yeah, that seems pretty reasonable.