So many Proposals take up unneeded space in the voting area, that distracts from proposals that may hold some value.
I proposal it cost a small amount of cake that is then burned to create a proposal. I think by doing this only people who are serious with proposals will do this. And if you proposal or part of your proposal is adopted you get your cake back. Other wise cake is burned to make a proposal. This would also stop duplicate proposals that essentially say the same thing, because it will be time stamped the first proposal.
Cost to make a proposl a could be equal to 1 cake.
And it would burn cake!