I'm a university student, and I enjoy traveling by myself, as long as I can do it on a reasonable budget. In North American cities (and in plenty of other countries), I pretty much blend in with the crowd, am not loud, annoying or obtrusive. What exact quality is imbued into someone who's willing to throw away EUR100/day that everyone else doesn't have? Doing this in large, world-class cities would turn any major destination into VIP hangout clubs for rich people. Not to mention that it's probably flawed financially - even if tiny towns that are over-capacity with tourists might be able to justify it, enormous cities will be forcing their businesses to lose money. Fewer people would travel to the city on account on it being too expensive, and the people who do travel would spend less money since they're paying the tax.

I'm very glad I don't live in Amsterdam, commuting there is bad enough. I'm actually trying to convince people to visit, among other places, the city I live in. Spreading the tourists around more will make everyone happier. Including the tourists.