Not an expert, but the reason seems to be they suck.
But this is all relative to perspective and taste. I see people ordering and enjoying Oliva G's, Alec Bradley (anything) Victor Sinclairs, 5 Vegas, etc.. and I personally think these are all garbage. It's all relative.
I MUST have cream+sugar in my coffee! And 1 Fiji Ice Cube with my dram please! haha
I've had a couple of acids that were pretty interesting flavor wise. I do prefer my tobacco non-infused but every once in a while I like some chocolate with my peanut butter so to speak!