When I started doing club dates and playing with BOC, I was very thankful that someone else was booking the gigs. When I went back to booking my own gigs I found it even more difficult. I lost some of my nerve/business sense, and had to build it up again. What made things even more difficult was that there were more bands and fewer venues.
My point is this: Booking gigs sucks and it's really hard. It takes patience, persistence, and it means developing relationships with some people who do everything they possibly can to NOT pay you. So after you do all this work, what do you get? You get to hear every member of your band complain to you. Why are we starting so late? Why are we starting so early? Really, 3 sets? Is this all you're paying me? Why won't this place give us free drinks? I don't want to play at this place anymore, why don't you book us somewhere else? Why do we have to bring people? Why can't my girlfriend get in for free? And on and on.
Now that I'm in a position where musician friends of mine are putting me on their gigs, I always make sure to say thank you. Thank you for booking this gig and putting me on it.
Believe me, after weeks or months of going back and forth with club owners the last things someone wants to hear is you complain about the gig they just busted their ass to get you.
So the moral of the story is: If a musician friend of yours gets you a gig, say thanks.
PS: if you don't start saying thanks, your gig booking musician friend will stop calling you for gigs, book solo acoustic gigs for himself and be happier, he doesn't care who you play with, stop being a dick.