for us, nobody wants white shirts for the sublimation base, and you can only do sublimation on white poly, IF you want the colors to come out right. But if you want to sublimate Navy on a Carolina Blue, or similar, or black on most anything you'd be OK. I did a lot of coffee mugs at home for family, it was cool, but there was no way I was going to do that for the shop, too damn time consuming.
Steve