I would purchase them if they were available at the event. Only hard thing is there rarely xs and small for my wife and I. Also need to accept cc and cash. Stickers?
Yes, keeping in stock every size and version is the main challenge. Keeping it simple is better if possible. More likely I would guess it would involve an estimate of what people will buy ahead of time, with purchase of just enough and the goal of selling out before the end of the event. We’ve over-bought and stocked plenty of everything in the past and it’s a pain when you have lots of extras to store and haul around.
Plus it commits the person organizing (previously has been me) to come to most events, and generally for most if not all of the event.
Accepting cash in general requires a cash box, which requires someone from the Board generally to be around the whole time, we used to do that all the time but there has been less enthusiasm for that part lately. Going cashless is a lot easier at the event but presents it’s own challenges in setting up payment systems for our small-time use, and verifying in real-time.
A lot of details would depend on whether it is the club buying and selling the shirts or an individual. The club definitely wants to support this. The goal in my mind would be to get more shirts and other BAR stuff into the hands of members at cost, rather than trying to use it to raise funds.
Regarding stickers- We have made very nice ones, and generally make them available at events. Not sure if we need to get more.