One reason people consider scalping to be bad karma is that scalpers who buy up huge blocks of tickets in advance end up depriving people of tickets who had wanted to buy them at the normal price. It may be your "right," but like many things people do because they think it's their right, it's still an asshole move.
The other reason people get pissed about it is that some people think of certain music scenes, such as indie rock, as a "community." In a community, you have responsibilities to other people, not just yourself, so again, gouging people is an asshole move. Are Pogues followers a community? I don't think so, since the Pogues long ago ceased being the exclusive darlings of alterna-rockers and are pretty much listened to by all Americans, at least once a year on St. Patrick's Day. So it probably doesn't matter.
Finally, it can be fun to gouge the scalpers back. This works best at stadium shows. I've never tried it at a small venue like the 930, and I think it would be harder due to the limited market. I've paid as little as $10 for a stadium ticket using this technique. You just wait until the band has begun to play, and suddenly the value of scalped tickets drops precipitously -- usually to below face value. Scalpers are desperate to unload their tickets instead of taking a total loss, so you just bargain them down.
