I didn't say it's the average size, just that they do have some Mediums available, also large, XL and a few XXL I still believe. The internet always includes the sizes that didn't sell OR they sell a "one size fits all no matter how small you are" size. That's normal. If they sell Medium at a gig, they appeal to more of the fans that actually went to a show i suppose. Also, just a very small amount of bands have started to make Mediums again. They used to be popular to make in the late 80s-early 90s, but until now, they have been obsolete. It's great to finally have a shirt (not a girlie) that fits correctly!!!