You pay an instructor, right? If you play a good 1P player for $20 a rack, you will probably lose every rack, but one of the racks may take an hour. When you play a good player and gamble $20 rack, you are similarly paying for a lesson.
Someone told a really good 1P player that I was looking to play 1P. He couldn't really find any players that wanted to play 1P, so he was excited to play. We talked about a spot, and he was a little hesitant about how many balls to spot me seeing as he did not know me. After we arranged the spot, the number of racks and the bet per rack, I handed him all the money. He said, "What's this?" I said, "That's what you are going to win."