Such a system would appeal to the type of voter who doesn't vote because he is rationally ignorant and/or calculates it isn't worth his time (b/c he is not a utilitarian and doesn't count common benefit as a reason to vote), and wouldn't donate to a political party because he knows there are far more efficient ways to transform money into changing the expected future of the world. He can see why the system is an efficiency gain using the same tools he can see why voting and donating to political parties is a waste of his time and money.

This creates somewhat of a problem for the proposal, if it is only appreciated by those who can't benefit from it...