Thanks for all the advice. Unfortunately I provided some dud info and they're not all the same price after all. The seats you recommended are more like 500 quid, so I could probably fly to NY and back, see a game, dine at Nobu, and come back again, and still have change from £500.
Unless they're throwing in a box of Cubans, a free bar, and a couple of hookers, I think 500 fish is a little excessive.
So, it looks like I'll be in the bleachers if I want to go. At least I'll be safe from any fly balls, as It'll feel like I'm watching from the fucking moon right up there.
Always read the small print.