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I wired my house with 62/125 fiber 22 years ago as a 1 km spool was only $250. I’m too lazy to look it up, but I suspect multimode fiber is cheaper than copper, and termination kits are cheap now.

I’m running 10G on single mode 100 ft jumpers to a few computers in the house and that’s cheap too. SFP are $35 but the NIC are more.

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Yeah, multimode fiber seems to be the red headed step child of the networking world these days, but that's a good question about the cost of it vs copper. It's just plastic, right? It seems like a good option for high speed SOHO or perhaps within rack networking. But if I was running cable in my house today, I think I'd still go copper for PoE capability.

Yeah, POE is great. I have a 48 port Ubiquiti switch with POE AP and cameras. I ran duplex fiber and 2 pair of shielded CAT 5 to each room. For the downstairs rooms, those are through short runs of conduit to the basement, so I can poke whatever else through there, like the single mode jumpers. I should have run conduit upstairs, but I do have a 4" PVC running from basement to attic, so I could run single mode upstairs, but would require drilling and fishing.

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