I'd say sure JB is "that popular" but the fact that they only have 12 seats (hence, only 6, even 5 for some shows w/ 10 seats, people need to get there before they're all claimed). That certainly makes them harder to get.
And yes, I believe the SRO is sold either an hour or two before the show...I'm pretty sure it's 1 hour though. That kind of irritates me though, since they're obviously already going to be sold out. Why not just sell them at 10? Why have another line of people while Will Call people are going to be flocking to the BO to pick up their tix??
Oh, and one more thing...when I did rush several months ago, they seemed pretty lax on looking at the ID. You're supposed to have both a student ID and a license to prove you're under 25 (I think) and I put them in the box one on top of the other (don't remember which was on top) and the guy didn't look at either of them at all. He certainly didn't look at whichever one was on the bottom.
But when did New Hampshire become--Such a backward wasteland of seatbelt hating crazies?...I mean, only 40 people actually live there. The others are just visitors who come for the tax-free liquor and three inches of novelty coastline. John Hodgeman on The Daily Show (1-30-07)