Apologies for my US-centric point of view. Not sure why our pricing is so much better, but it’s unfortunate that the EU and especially the UK get screwed by Canon on cost.
Incidentally, I was kidding about the math. That’s why I started the second paragraph with “Seriously, though…“ Having said that, I wasn’t actually kidding about the cost of adding a second camera. Zoom lenses are popular precisely because they offer versatility. You could carry three cameras with a 24mm, 50mm, and 85mm prime lenses on them, or you could carry one camera with a 24-105/2.8 zoom (provided of course, that f/2.8 is sufficiently fast for your needs).