The one "temperamental" singist I've played with showed the same symptoms. Late for rehearsal, hadn't learnt the songs, turn up 5 mins before the start and expect to just plug his mic into the desk, gone 30 secs after pay time. He turned out to have a few alcohol issues which explained a lot. Bye bye singist!
My old drummer used to take extra money for PA and lights. We ended up getting rid of him mainly because he was an egotistical tw@. These days git/vox does the PA, I do the lights and drummer sets up his drums - money split equally, peace reigns