Considering that I fall into your loose timeframe for active users I'll bite into your crazy sandwich.
To what end would these established user IDs be used? I propose the following:
1) Price gouging and/or shill bidding
2) Positive feedback on a forth coming somewhat pricey product that won't really exist that we'll all get suckered into buying only to be totally scammed while the originator is in the Caymans.
3) One master user has been building way too much stuff and doesn't want to make other folks feel bad?
4) Somebody is scared nobody will like his build so he's created a bunch of IDs and then upped their post count so when he posts his build he can self promote and self congratulate without us catching on.
5) You are actually every BYOACer and all this is in your head. You're not even really reading this, you're just imagining all this. In all likelihood you're actually an whale fetus undergoing prolonged gestation. Once you are born you will forget all of this, complain about the "whale condition" and be frustrated by the nagging feeling that you are a spiritual being undergoing a temporal physical experience.