I got mine at the C 50 show (a Polo that's also offered by Merchant Direct) and I've worn it many times. I never throw it in the wash - only dry clean. Cost me 45 bucks. It's still going strong. Got a cheaper one too like yours ($30) that I wear sometimes and never wash - only dry clean. It's fine. Have one unworn that I leave on the hanger. Got another one with the Indian on a horse Brother logo on the front and "Endless Summer" on the back that is of much, much better quality from another source (not Merchant). You pay for what you get.
Problem is, I didn't get what I paid for. Shouldn't have to dry clean a tee shirt to keep it in one piece and it wasn't like I was beating it on rocks down at the creek.
Ordered a tee shirt from the RUSH website last year, same price. Shirt was made of heavy material that has survived dozens of wearings.