OK, two different view points from me. The first view point being in some agreement with this :-
Surely we have seen the one where the bar, club, or restaurant owner gives it the "How much? that is a lot of money!"
The musician spokesman for the band then says, "OK get six plumbers to work for four hours on a Sunday night and we will do it for half their price!"

The second viewpoint being :-
Now for a fully amateur musician playing in a typical UK brass band, it is amateur status so no individual pay to any player in the band. The band charges £300 to £400 for a two part concert lasting around the four hour mark and that band gets regular work as far as a brass band goes.
Which in reality will be between four to maybe fifteen paying jobs in twelve months. (Depending on the band and its reputation)
In between that the band enters contests where the band actually has to pay a small fee to enter. If the band is any good such as the band I recently left, good results on the contest stage means money prizes, and depending on the contest, venue, and organisation, the prizes can be as little as £100 for first prize with lower amounts for second or third place, with often a third place being nothing more than a cup to put on the trophy shelf.
Other contests can of course give a first prize of as much as £1000. However, many contest entering bands don't get anything more than a piece of paper telling them their fourth, fifth or even tenth place was due to what the adjudicator found was faulty in their performance. Why do the contesting? because good results, due to good hard work from all players means a higher reputation, which in turn gets better paid concert or other work.
Whatever the amount of cash a brass band accumulates over say a twelve month period, that money will be divided among many claimants, rent, power and heat for the rehearsal venue, new or replacement band uniforms, new or replacement instruments, as although most small instrument players can afford to buy their own, the price of a new double Bb bass tuba and the other large instruments is way out of reach of most pockets, so the band itself has to foot the bill for replacement of worn out or too badly damaged instruments. There are of course many other small to large costs too, and for some bands a small retaining fee is paid to the MD which may be only a few hundred a year.
Where does the time go in between the paying jobs after playing the contests?
Mostly on rehearsals twice a week for two to three hours each night just to get the polish on the next contest piece, or to get the seven to fifteen pieces of music fully up to speed and as good as possible for the concert.
As I said, all amateur players who do it for the love of it, the only man or woman who gets some pay is as I said the MD and that is usually only a token fee.
Bearing in mind some players do seek out paid work where trumpet, trombone, or other orchestral, jazz, and other brass work will pay them individually, but they have to be very good players as individuals before they can gain that work.
Most, even though may be good enough, don't look for that work, mainly because of lack of time or they just don't need it.

Just a different viewpoint on the discussion about musicians and being paid to be one.