Vintage T-Shirt Forum & Community Authentication Appraisals

Was researching NOTRE DAME shirts in Ebay completed and found some selling for a ton. Some of them were coming from Indiana. Then I search active listings and found many of those same shirts available for a lower Buy It Now, but still really high. Different sellers, but also Indiana. Elaborate scam to give impression of higher value?
Just search vtg notre dame shirt and sort highest price first(completed and active).

Being in Indiana, I often find Notre Dame shirts. They sell, but not for super high prices and sometimes they take awhile to move. I've got a pretty nice Ched right now in my Etsy shop, but it's been there for awhile.

Maybe I should put it up on E Bay and see what happens...