Yeah, quite often the support acts are crap, but not always. At Steve Earle a ccouple of weeks ago I heard a support act called Joe Pug, who was truly amazing.
http://www.myspace.com/thejoepugMK doesn't tend to have support acts in the UK and Europe, I wonder if it's something to do with the Union rules and stuff in the States? Also, I think quite often these acts or their record companies actually pay to get them on the tour, so I guess that's an incentive to PCM.
"Everybody pays to play..."