Experience has shown that a lot of "go with the flow" votes appear to get cast on most considerations because even a fairly small minority of "keep" votes usually means that making the requested change will result in grumbling and subsequent sampling will likely show support for undoing the change. It appears to take more will to vote against a consideration than for it, so "keep" votes get more weight than other votes.

There may also be some bias in the samples of who votes on considerations and who participates in forming site policy. But site policy is, of course, biased towards those who most participate in forming site policy. I consider this a good thing since I trust the judgement of those who actively participate in site policy creation and enforcement over a general poll of active members.