Capitalism at work.
What’s the problem?
The vendor has a captive audience. He’s a smart guy. He’s making more money with less effort that the schlubs carrying their heavy load up and down the stairs. Give credit where credit is due.
Efficiency is a hallmark of successful capitalism, and the ones that never figured it out, or wish they had thought of that will always turn on the successful.
That's what I thought. Oh well. Anti-capitalistic putz.