There are a ton of places to sell independent shirts these days and everyone I've talked to has a different workflow of where and how to make money. I thought a community where artists can share ideas and tips would be beneficial.
Yes, you might be helping a small portion of the competition, but you'd be giving yourself an advantage over the vast majority of the competition not in the community. :-)
I go by Grundy most the places I sell my stuff and I'm actually very new to this. My store is on TeePublic, but I've sold stuff on shirt-a-day sites as well.