You're right about how expensive it is to do magazines these days, and how difficult it is to find advertisers from such niche ones. It's even harder if Barnes and Noble doesn't carry it, so it can reach a broader rpg audience. It may be distributed at some B&Ns, for all I know, but I have never seen it at one here.
I would probably buy it (or subscribe to it) if it were a few dollars cheaper, even if that meant printing on less expensive paper. It's not that I'm a miser or anything like that. I already have a few specialty magazines that I pay $10 for, mainly because they offer things I can't easily find online. It reached the point where I had to step back and look at how much I was willing to spend each month on magazines, though, so I'm much pickier these days.
It's a nice magazine with some interesting articles, and I wouldn't want to dissuade anyone from checking it out.