savageorange said:
Doesn't any figure also need to account for the fact that the same image can be and sometimes is bvatsed >1 time -- for example, when max res versions are made available only after a significant delay? (so ideally you'd be able to search for the superior posts rather than the posts which they replaced.)

It also dosn't account for posts that were once replaced for BVAS but the posts that now replace them have been deleted because of takedowns, but I'm not going to go through every single one of those 3.4k posts to check, that number is about the best you're going to get. The amount of posts that have been BVAS'd twice and posts that have been BVAS'd and then got takedowned are probably extremely few, and I doubt that it'd change the final number more than about a few thousandths of a percentage.