I don't think this is a good idea. If people get money to vote the voting booth will be flooded with stupid people who don't care for who they vote and just come for the cash. The masses just need to be educated thats all. Voting in itself is already a reward if you ask me.
Who determines what a good proposal is? We actually already have such a system in place. The politicians who are beneficial to the people in power will get a reward from them: money.
On top of that ethical politicians aren't motivated by money. So they don't care if they would get more pay for doing their job well.