True, but I wish I had this knowledge when I was 17!
Even if you're not playing at bars, but at coffee shops or other all ages places, you can still figure out and ask the owners/organizers what makes them more money and/or makes their night easier. Having the mindset that unless you can sell yourself, and help others make money too, will really help your music career in the long run.
I can imagine this is very true. It doesn't have to be alcohol. Wherever you are playing, you have a powerful tool in a microphone. People already think you are "cool" because you are on stage. And the mic lets you influence all (or most) of them at once.
