Yep, all mods have multiple blocks. Oh, wait...
So, apart from a non-Mod having multiple blocks and a mod having 1 block, your conspiracy theory seems to be holding up well. :facepalm:
They're a crude indication of how loved you are by the mods. The more you have, the more positive comments you've received in the secret mod database which tracks every poster's activities.
That - or see the rep is back thread...