Who are these people who eBay Mets Free Shirt Friday tees?

What is the mental process here?

Hey I will go to Citi Field, get a shirt, take a picture of it, post it to eBay, and then ship it out when someone buys it?

What is this thought process?

What’s even the profit margin?  Are these people walking to the game and getting free tickets?

Whoever these people are, I do not wish to be their friends.