Earlier quoted context omitted.
It's more than love - I have friends who will actively refuse to buy games on other stores, even for significantly better prices. (To be fair - I think some stores like the Epic Games store actively make playing games on them worse, e.g. I played Alan Wake 2 through Epic and the achievements notifications were massively distracting, ruining many scary and dramatic moments, and they turn themselves back on every time…
That's basically me. While Steam can always be improved (and has been), it has worked well and to me looks better than the alternatives. Additionally, I trust Valve and value it's products. So I don't mind paying more and it's also very convenient to use just Steam and not worry about anything else.
Imagine a world where a PE firm gets its hands on valve