Well, I'd always rather make a direct donation, because e-vendor markup seems to be ridiculously high right now. If that could ever change, then yeah. Or maybe I'd buy one anyway, because it's cool.
I'm a smidgen surprised that not one active member has taken up silk-screening as a hobby for some period of time or another. I can do a decent bleach-stencil t-shirt, but something like kingmudsy 's creation requires something a bit better than low effort tie-dye.
Not especially. With bleach shirts it's difficult to get lots of fine, lean lines. You could do a straight up hubski logo no sweat. Depending on the brand of undershirt you use you can even make the bleached bits different colors. I have one with a stencil of the 40k Eye of Horus on it. If I can find it i'll post a pic.