They don't use more than 100% voting power because of the experiment and any votes above 700 MV get automatically flagged by @abit and @smooth.
Why a plot to rob users of voting power? It'll have the same amount in rshares than right now with their daily voting power except that users won't have to post as often as they do now to reward themselves more with 1 full vote instead of 4.
I find the lack of knowledge in this from a top 20 witness disappointing.