Seems like this system is vulnerable to vote trading. Additional votes in a single category cost more so the logical move becomes to trade those additional votes to someone who wouldn't have voted for it in exchange for your vote on something you wouldn't have voted for. A group of people coordinating votes becomes significantly more powerful than an individual expressing their own interest, making it the dominant strategy. Seems like it would end up with even more distorted dynamics than the ones it was trying to solve.