I blame the current system. It's too static, once the majority of people have voted. Draco and Granite are just eager, is all. I'll see what can be done about that. My exams are over in four weeks, and I'll have two more weeks free after that. I am also not too happy with the current system, it works, and it's certainly better than the manual polling we had before, but I also think something a bit more dynamic would be appropriate.
Some things I have in mind are extensions to the simple list, like panels for the newest suggestions and a random pick. Also, vote accumulation over a certain time period could be interesting (think "hot" suggestions), or how a suggestion has lately fared in the global perspective (up or down).
Another idea is to incorporate different voting mechanisms into the list. Some people seem to prefer being able to give votes on all suggestions (including negative votes), and another request was a comparative algorithm, that queries the user to answer a series of "which do you like better" questions on two randomly picked suggestions.
The main idea is to not replace the current system, but to add the new functionality along it. Think different tabs/pages for the different voting mechanisms. This should also be an interesting experiment, to see which suggestions rank how in each different system.
And of course, some UI improvements might also be needed.