First Class Carpet

Ok so I’m flying on my monthly trip and I am waiting to board my plane. I am in Group 1. So, I get up and stand near-ish to the roped off lanes.
They have a Priority/Platinum/First Class lane. This is a strip of carpet that is roped off from the other strip of carpet right next to it. This special strip is only for these special flyers.
The gate attendant lady checks them all in and then walks down the commoner strip of carpet and uses one of the nylon strap retractable turnbuckle thing to block off the special strip of carpet before calling the regular passengers.
Ok, I understand first class having better seats. I think if I were in First class, I would want to board last to avoid the riff raff that sits in the back, but that is another topic. A special section of carpet about two feet wide that parallels and is adjacent to another section of carpet?
People pay extra for this. What is the special reward here?