As we all know, a thumb simply means someone on the internet likes the post. Nothing more than that.
We’re going through an inflationary period for thumbs right now, but we’ve also gone through deflationary periods and no doubt will again. Traffic varies with season, users come and go and the culture of WAYWRN changes as a result, and so forth.
I suppose one way to compensate to some extent would be to take it by calendar month (October, November, etc.) and take, say, the top ten percent by thumb-count. But that’s much more work than anyone should be expected to do.