I was a valet while in college at a very nice hotel/conference center. Whether it was .10 or $10, I was grateful as it was more than I had when I started my day. I could have chosen to continue in that profession or finish my education and move on to other careers; either way I made the choice and never expected anyone to 'give me' anything. I knew the hourly wage, I knew the hours and I knew the demands of the work...……..why expect more? Fundamental flaw in a person's logic to place their well being on 'subjective tips' and then feel degraded or ungrateful when they receive one, no matter the amount.
As far as the power company argument goes; flawed logic. The agreement was with the outfitter for the price of the hunt, which is paid upfront...…..doesn't even make sense. Not following that line of reasoning when it comes to comparing ones thoughts on the 'tip' mentality.
What doesn't make sense is your undying belief that social convention can't still exist outside of a legal contract. Using words like "logic" and "sense" deosn't make that ignorance seem any smarter.