I've probably spent as much or more money on my Deck than I ever did on Steam, and I haven't even gotten it yet (tomorrow is shipping day!). The SSD upgrade and SD card alone cost as much as the base Deck (on sale)!
Most of my gaming has been on the Switch or PS5, but I'm excited for some portable PC gaming, emulation, and game streaming to the Deck. I used to be way into PC FPS games when I was younger, so I'm excited that the Steam deck can provide that Mouse & Keyboard feel with the touchpad (and/or gyro).