These replies have really helped put things in context. It might have been a good networking opportunity but this was for a band I don't know and a bit of a drive away. I slightly know the person that asked me. I turned it down saying I'd be more than happy to dep for/at a gig. (It's mainstream jazz, so mostly leadsheet stuff) or to dep rehearsals online. I did this a lot between 2020 and 2023 (jamulus) and I found it to be an excellent way to rehearse. No humping gear. No freezing rehearsal rooms. No commuting. No standing around waiting for people to have fag breaks. I do enjoy playing jazz on EB but like some of you here, as I get older, I get pickier about how far I'm willing to go and how late I'm willing to set out!