Voting in cash?

Okay, let's assume I live in a flat that has crappy internet. Not hard for me to imagine, given my current circumstances. Now how much money would it be to hire someone to instead good internet of awesomenes? Some amount, right? A thousand dollars, let's say. Since there are 100 of us or so in this building, that's really only ten dollars per person.

So what about this kind of solution: You get a secure box, paypal account, whatever, and then you put the total cost of the installation onto the box. People put in however much they want to contribute, based on how important better internet is for them. 5 dollars? Ten dollars? Twenty dollars? Then when the money reaches the threshold, install internets with the money, and invest any surplus into a trust which feeds maintainance costs.

Obviously there are some logistical problems, but I really kinda like the idea.

But what if we could implement that better? Say with free money-transfer, digital boxes, etc. Organized. For local government, say - you want a road someplace, you go dedicate money to the fund, when it fills up enough, then it would be made. Only the people who want the road will pay for it, and in the amount that they value it.

Traditional taxation is still important for maintainance money, health/social care, etc., but for initiatives, it seems like a nifty system.

I wonder where all the places in which this sort of thing could be applied...