I was expecting far more! I'm definitely ok with this.
Looks like someone has beaten me. You're the new Steam Spendy King.
Saw this on PCGamer.com and it's just as bad as I thought...
https://help.steampowered.com/en/accountdata/AccountSpend
Note that this does not include redeemed keys. That means that Humble Bundles, Green Man Gaming, retail boxes, etc... DO NOT count towards the total.
TotalSpend 2018-06-13 17:36:32.060 $1,467.87
OldSpend 2018-06-13 17:36:32.060 $148.72
PWSpend 2018-06-13 17:36:32.060 $0.00