Pretty sure some will be more than that. 

It's a shame for lots of bands cancelling tours due to poor ticket sales but I'm one of the culprits as I'll wait now closer to the time as theres always a chance of a seat filler or Twickets for half the price. If the bands charged a reasonable price to start with then they'll sell out regardless. Look at Paul Heaton, £39+fees tickets for arenas where some bands are charing £150+fees for the same arena. Prices for drinks in those places is a joke too so many pick and choose.

Might just wait it out for the summer shows that got mentioned tbh

Good on him i think, though it depends on whether he really does love the music (like Steve Davis) or is just moving into it as a bizarre career option (Gok Wan, from the ten mins i observed from the side of a field once, stood there with no idea whats going on) 

Better Man, Black maybe. I guess was the same for Metaliica.   They do have a history of bringing on some big guests, for example Pete Townsend and play Who numbers. My gut is they would prob pull it off but they'd get a section of crown leave after a bit. I don't see it happen even though I'd love it.    Other Stage would be immense.   I seem to remember Emily Eavis watching at a Wembley arena night and if it was regular gig with more random unknown fan favourite songs she saw she prob thought not suitable for Pyramid.