I have been in concert photography for some time and when I was starting up I used to shoot for free for some venues to get my name out there.
I mostly stopped doing that but some venues still invite me expecting me to do free work. This particular venue has been spamming me this summer so this conversation happened:
Client: Hey! It's the last week before we close down for summer. There's two concerts scheduled this week, would you like to shoot one of these?
Me: I am free to shoot the Thursday concert! Do you have a budget for these concerts?
Client: Unfortunately not. We have a policy not to pay for concert photos.
Me: Well, let me know when the policy changes. I changed my policy about working for free.