Originally Posted by
Tchiowa
"The common law of business balance prohibits paying a little and getting a lot. It can't be done. If you deal with the lowest bidder, it is well to add something for the risk you run. And if you do that, you will have enough to pay for something better." John Ruskin.
I was helping a friend buy a ticket on line on UA the other day and it said the first checked bag was $25. Which reinforces the question you just asked.
As you have reinforced that everyone who travels CAN pay for a bag, they just don't want to.