The Obamas are highly intelligent and have a lot of things to say that are worth listening to. Why would people pay to listen to Harry and Meghan?
I think there is an assumption that lots of their celebrity friends would buy tickets. But let's face it, you're only going to turn up once. These people are more used to going to things where they don't have to pay anything (Royal Weddings) and get lots of freebies and free publicity on TV thrown in.
The content will be dreamed up by speechmakers and whereas when you go to see the Obamas you can be reasonably certain that they will speak directly to the audience with occasional reference to notes because they are accomplished and intelligent people used to public speaking, M&H would be standing there reading from a script for an hour to an audience who have probably paid upwards of ten grand per person. The transport hotel and security costs for this farce will be unbelievably eyewateringly expensive. And in order to make a decent amount of money they are going to have to fill all the seats every single night.
This isn't Mr & Mrs Average paying £100 odd to see the Spice Girls or Madonna in London then following them up to Manchester to see the show again. These are seriously rich toffs and let's face it, there are only so many of those in the world and once you've seen the circus once you're not going to go again.
The likes of the Khardashians make money out of the likes of you and me spending our hard earned cash on their £40 perfume or whatever. It's mass appeal that makes the megabucks. It's volume that sells.That's why Madonna only plays venues that seat thousands of people. At £100 a pop it's a massive wodge of cash even after all the expenses. A speaking engagement it's possibly 100 people if you're lucky.
Would you pay £100 to go to a Spice Girls concert? Would you pay £100 to attend a speaking engagement hosted by Sarah Ferguson? Didn't think so.
All the ordinary people coming out in support of H&M are quite happy to pitch up and wave their flags on the pavement to see them for free. But if you went along and charged everyone a fiver then they would just leave.