People need to understand that the fact that one does not agree with a proposal does not mean this proposal is "bad": after all, opinions will vary from people to people and no one single voter, but the majority of voters, will own the final decision.
The system brings proposal submission rules, as well as proposal approval rules. If one manages to have a proposal submited into the voting system, this person (no matter who) has got the right to see the proposal discused and voted: this is exactly why this system was built for (as buster and qwizzie have said above).
And more: regardless of individual opinions, if enough other voters agree with a proposal, it will be accepted into the budget, and this will never be a reason for shame or risk for the system, because it is the will of the majority, in accordance to the previously settled system rules.
If anyone believes that there is a failure here, and that these system rules need to be improved or tweaked, he should start the necessary discussions, and it should have its own thread and focus.
If, eventually, there is a failure in the system, it is the system that needs to be fixed, and not the voters.
By now, what matters is that the proposals are well discussed, and I am glad to see that it is happening.