On a serious note, if you have some awesome designs people may well pay a premium for that. Just a logo? Not so much.
As Bangladeshi shirts cost all of 10-15 cents USD to manufacturer and the middlemen take almost all of the profit, you would be hard-pressed to find a competitive edge over the countless other brands selling generic clothing with generic designs for generic prices if you don't have something unique.
Go to college, hire hipster industrial design student for some kraft dinner, and get some cool designs =D
just my 2 cents.