I think that's really cool idea. It's like the whole process of finding a rave. I like this one and nowing the theory behind it and what it's for makes me enjoy it even more. It makes it ok for it to be hard to read. Which is why I don't usually groove on seripops as poster art.
I'm a fan of High on Fire and think that this poster is just fine. Great in fact. If I saw this poster in a store I'd be more stoked that High on Fire was playing than irritated by wether or not the poster fit the band. Which this does, in my opinion.