Am sure a lot of pubs take the wider view of assessing profits on a weekly/monthly basis rather than nightly.
Overall outgoings (including entertainment of all types) set against takings - if its looking okay, then
live music survives!
I'm in the very fortunate position of playing a weekly residency at a pub with a great landlady, who takes risks
with live music and it's paid off. Before she took over, the pub used to charge on the door to help cover our fee-think it was £3, and we used to get maybe 50/60 punters on a regular basis. When Maggie arrived, she did n't believe in this, and made it free entry which I thought was financial suicide. Glad to say she was right - we now get over 100
in each week, along with a few who pop in for a swiftie as well, so her takings have increased a fair bit.
Just wish there were a few more who had her vision & bottle to give it a go.