I really need to update this - been some excellent suggestions and some new contributors. Annoyingly, my laptop audio/video has gone wonky, so will have to try and do it on my phone.
Part of a general change in music consumption, with pop acts (Little Mix, Ariana Grande) playing arenas way bigger than pop acts (Nik Kershaw, Thompson Twins) thirty plus years ago. The latter would have way outsold the former in record sales.
I'm a big fan of Tom Morello's work with Bruce Springsteen. Guitar on Ghost of Tom Joad is just so different from what you would expect, and the clash of styles works brilliantly, giving it an edge.
I think Shiply pricing is very much down to availability. If someone has space on a run to nearby locations you will get a good deal. Also being flexible on dates. I've had a great price from them for car transport and some eye watering quotes for other things.