The very premise of the voting system is "Subjective Proof of Work", or "Proof of Brain" if you will. We're allocating money based on work done for the network and value attained. This kind of bought voting for the sake of advertizing completely undermines that. The only people benefitting are those selling their votes, the network overall gets a net loss as money from the budget is directed towards non beneficial outcomes that aren't being judged based on value but based on suspended judgement in exchange for money, equivalent to a brown envelope in traditional politics.