to be fair, my taxes go towards other areas that wont effect me either. I've paid national insurance for god knows how long not had to use it for years and only very been very minor issues that take 1 minute to sort out. my partner goes a few times a month it feels like yet we pay the same sometimes i pay even more.
i think it's a bit naive to think that something like the royal wedding wont benefit you in any way what so ever just because you aren't in the city. the extra in tax is what 5p? complete guess but doubt it's much more then that possibly less
you've mentioned the cost as a total number, our country etc, but the benefit you wont count as it doesn't effect you so then ignore us a country.
edit: besides, i thought you run an online store? i'm sure work will increase for carpet cleaners due to the wedding, and i'm sure plenty of them will be customers of yours. Hilton appears to have more work now because of the wedding, if he buys from you that'll be just one of the indirect benefits (but still a benefit) to you for the small increase in tax.