They seem like they haven't been touring as much in the US the past few years. They seem like they might play to bigger crowds over in the UK. I think they fell victim to the whole major label not putting any money into sorry for partying and the public kind of throwing them to the side over here because I know they've been playing smaller places here in the states.
Indeed, they only get a fraction of the audience in the US as they do in the UK. I can't say I blame 'em, but I love seeing them. Just read that this is their 30th (!) time going to the UK.