I think a tip is for service above and beyond the expectation of the service. A bartender that looks me in the eye four times before filling my glass gets nothing, and I move on the greener pastures. A waiter/waitress that matter-of-factly takes my order and delivers it incorrectly, never checking on me, nothing.
A simple smile, and single check in gets 10%. The wrong order delivered that gets corrected and they check on me a few times gets a bump. I'm not a fan of tipping for doing your job. I know wait staff rely on tips to make a meager living. If you want to make more money do a better job or GET a better job.
As for some schmuck reaching into my trunk and grabbing my clubs... He'd probably come back with a sore hand. I put them in the trunk, I think I'm capable of getting them out and strapping them into a cart.
With that said, I suppose if I was on vacation, at some resort, I would probably bend a few of my rules. But the service still has to be done with a smile.