Watching a documentary about the most successful promoter in the music business right now opened my eyes about a lot of things that go on behind the scenes in music/entertainment.
Remember the Police tour...back in 2007 I think it was. The first tentative conversations between Sting, Andy Summers and Stewart Copeland involved a lot things including if there would be any interest in a world wide Police reunion tour. So when they hired Fogel to promote their tour they were apprehensive about whether tickets would sell or if people had forgotten about them. Turns out that not only were people excited they ended up playing in football stadiums to meet the demand. The funny part is within hours of rehearsing to get ready Copeland and Sting were already at each others' throats, they have never gotten along and making it through the full length of the tour itself was a minor miracle and I don't think there will be another Police tour ever again.
What's this got to do with Elton you ask?? Well Sting only wanted to put the Police together again to make stacks of money because his wife had almost spent his entire fortune so he needed to replenish his bank account.
So like Bob D, Foreverblue and SDM have mentioned in the end it's as much about money as it is performing.