There's no benefit at all and your analogy is exactly right. I saturated my average and played hundreds of rounds on Kiawah back nine to attain Legend, Tour Legend and finally Champion. Since I own the club I set the back nine on the easiest possible settings, wind, hole placement, length and green speed, which for me was Very Fast.
The only benefit is bragging rights, but in reality it's not a measure of how truly good you are and it sets the tees way back on regular WGT tournaments. You get a few WGT credits, but a couple hundred here or there goes quickly if you use balls worth anything.