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I have no idea, quick google resulted either something between 2.5-6million for FF and Eminem, or 500k+ for FF. Eminem and Madonna is probably pricier than FF, but the gap is much smaller I think than between Sheeran and the National. Anyways, as you said you can pick any two artist to make it like you are right, but I think one average a band costs more and also takes much more logistic to move everyone and everything that comes with a band. 

Wouldnt mind a solo Brandon tour next year. The couple of albums he has put out are top notch disco tunes. 

Yes please!

I've seen him live too and he's fine if you like that sort of thing. So definitely a future Glasto headliner. 

You can pretty much change it to fit any argument.    Would foo fighters command a bigger fee than say Eminem or Madonna?