You have to keep in mind that most of the Motorhead fans that go to the concerts these days are pretty young. Many weren't even born when Ace of Spades came out. They are mainly familiar with No Sleep till Hammersmith and greatest hits albums. To keep the young audience members happy, they have to play alot of their old classics. It's actually a great setlist but it would be nice if they could play more lesser known songs. When they played a few songs that aren't officially classics, the audience wasn't enthusiastic when I saw them last.
It was the same the other year when they played Cradle to the grave the other year.I'm going mad for it and the people round me wondering what the fuck this song was!!!
When I saw Rock It was on the setlist last year I was practically dribbling with excitement. So imagine how saddened I was at the couple of gigs I attended when the song got a relatively muted response from the audience, as opposed to the huge roar for songs like AoS and KBD which get played every fucking year. No wonder bands stick to the obvious, certainly if they gauge what to play by the feedback from the crowd.