Another take on pricing is what I used to tell club owners in the 80s:

"I charge $xxx to set up and then I sing for free."

The reason I have a set fee is not because I am a bigshot, but because I do so many private affairs that are referals. Imagine how Client "X" would feel if they booked me at my regular rate, and one of their friends was at that party, and booked a date also. So, Client "Y" negotiates a lower price, then brags to Client "X" about the great deal they got.
Baaaaaad business.
Not gunna dooit.

Everyone pays the same, or they get somebody else. I will, from time to time bargain with hours or gear, or setup, but the nightly fee has to be paid or I can't justify the date.
When it becomes impossible to continue on like this ........ that's when I'll retire.

Someone once told me that if I don't loose at least a FEW jobs per years because of price, then I'm not charging enough.
I believe that to be true, and yet .... I almost never loose a date to price. Just a few. A very few, and I can live with that.