I personally think the big factor in this tour is the cost...
Whilst the verified fan system has created a bit of fence to jump over, most people think it a good way of stopping the touts/scalpers, and have got over it.
However then being asked to pay high prices has put them off. Either they can't afford it... or they think the gig isn't worth that money.
So the multiple attendees from previous years, cut back on their shows..
The uber fan, buys one ticket and not ones for their spouse/partner/kids.
The casual fan, doesn't go at all..
Get the pricing sorted and fill the arenas, with multiple shows.....