Another way to look at it is he's riding the coattails of the classic era of Genesis music. At this point it's fair to ask how many people would show up for Hackett shows if he was just doing his solo material in concert. I admit I'm a bit grumpy on the subject after Nad made that a**hole comment a couple of weeks back about which show people should choose to attend (Genesis or Hackett).
Barely anyone is the answer. Just like no-one if going to see ray Wilson who is someone else really miking the genesis back catalogue