The bios are hard for me to interpret. So many nostr bios look just like that, but are presumably genuine. 

Yeah mostly. Then that paired with a bio that is so obviously bait. 

“Senior developer | patriot l loving husband | bitcoin only | no shitcoins”

k00b

I've been making an effort to be more discerning.

Is it just a lot of newly generated accounts that never do anything else?

Undisciplined

Lots of fakers creating new accounts it seems. Make them work for your sats greeters.