Wow, my first post here and I'm going to jump off into the mud. I am not a big fan of "tipping" anyone...regardless of their job. When you take the job you know what you are going to be making. If you are not satisified with the salary then don't take the job. If people are making less than minimum wage and are willing to accept it then they just get less money. If the employer cannot afford to pay a decent salary then they should raise the price on their items/services.
I will not buy from the cart girl/guy because of the inflated prices AND the expectation of a tip. I think it is the tip portion that bothers me more than the inflated prices.
Also, I'm not going to pay $75 or more to play a round of golf. It is just not worth it. I could take my wife and kids out for the night with that much money. I'll draw the line at $50 and still feel that that is a bit on the steep side.
I am guessing you're fairly young. That's an attitude shared by under-30's.
If you don't want to tip that's your prerogative. But in the case of a cart girl, she has provided a value-added service. She drove out to you & served you so your round wouldn't be interrupted.
Plus there's a good chance she's cute as hell. That's worth at least a buck from me.