A couple of years ago I'd have said Amazon, but they've been shooting themselves in the foot so badly, it's like they want to piss off their most loyal customers and vendors.

I like Dreamspinner Press (as a place to find gay romance) but I'm pretty selective about what I read, and I wouldn't say I'm loyal, just somewhat supportive.

I have my favorite brands of organic coffee and raw cocoa powder, both of which I really really love, but if they started dicking me over on pricing or quality, and I could find something better, I wouldn't stick with them. (Healthworks Cacao Powder-raw and organic, and Cafe Don Pablo Subtle Earth Organic coffee)

I like McDonalds fries but that's a taste preference, and I'd hardly call myself loyal to the chain.

So I'm not sure there's anyone, really.