My neighbor is in a local band that has a following and they get a $2000-$2500 per show.
Hes been doing pool and house parties since the bars are close as got a $4000 for a pool party. They also have just did a Facebook live show.
The only bands I know that get paid that much are touring bands, maybe some tribute bands, and bands that play private corporate/wedding type gigs.
Your typical bar band playing covers to between 30 and 200 people on a Friday or Saturday night will usually make anywhere from $250 to $800.
I've played a few corporate gigs, got paid about $3K for those. My typical bar gigs pay between $50 to $100 a person. Some of the gigs in venues that are considered A-list pay $800.
It also varies from market to market. In South Florida the pay is usually about double what it is in SoCal. A gig that would pay $400 in South Florida will likely pay $200 to $250 on SoCal.
No musicians I know do this for a living. The few that do are all about the corporate/festival/wedding type shows and run it like a full time business doing gigs between 5 and 7 days a week. That's a very very hard business to be successful in.
Back in the late 80s and early 90s it was much better for bands. A touring cover band playing nothing but hair metal covers could easily pull in $1K-$2K per night plus lodging plus food and beer. When grunge took over and the hair metal scene died, so did the days of touring cover bands making that much money.