To my knowledge we've only adjusted the cost of three edges in the last year (possibly longer). I increased the cost of Golem Guardian and lowered the cost of Roll the Bones / Spin the Wheel.

Likewise, I believe my changes back in December were the only significant changes to how edge points are accumulated in a number of years.

EDIT: The way I read your post that you were suggesting we've been mucking with this stuff on a regular basis, which I don't think is true. However, I write this with every intention of doing some edge surgery in the coming weeks/months, so in that sense I suppose your feelings aren't wholly unjustified.