I still think it would be nice if there were more shirts put out by actual bands and labels. Good looking ones. After all, it is a way of supporting the band/label. In metal, there have been some "shirt labels" that have printed small runs of well made shirts with various bands, with their permission, and that could actually be a "business idea" for a small side activity.
Then again, I'm not too sure about the economics. It is perfectly possible to print very cheap shirts for 5-6 Euros, but selling those could probably qualify as a rip-off. FreakAnimalFinland may perhaps know a bit more about the profit margins if you use a decent quality shirt? Even for someone who doesn't need to make money, it's not great to lose money.