Good question. Mostly 2.5Gbps cards and 1Gbps (or less) wireless, but the value is in the aggregate use of the network - I have a decent homelab, Tailscale for accessing things while on the road, various streaming things and so on. I will likely add a 5Gpbs card to my next server build.

My ISP keeps encouraging me to upgrade to 7Gpbs symmetric, but even I don't need that much bandwidth (yet!)

FWIW, the speedy fiber service costs about a third less than the cable service it replaced, which was a fraction of the speed.

Do you think that is unlikely? Its not like those cards are hard to find.