"Feel free to do what you want, but I would guess that 99.5% of professional commercial photographers (not weekend soccer moms mind you) are shooting/processing RAWs."
"I shoot a lot of low-light work - events and such. I also have shot a lot of musicals and concerts where flash is not allowed, the action is fast-paced, and I usually don't have the ability to get a feel for the show beforehand. Shooting straight to jpeg and getting good images would be basically impossible in this situation. You don't have time to bracket white balance when you've got action on stage going on. Also, underexposing and pulling up shadows works amazingly well when I need reach and I'm shooting my 300mm f/2.8, but still don't have the light to shoot at a proper shutter speed."