Thank you!
s there a voting bot that automatically votes on comments? or maybe most or even all of these 16 accounts are controlled by the same person? That is another violation to weed out.
I would side with thinking that they are owned by the same person.
It's ok to have multiple accounts, but using them solely to upvote your other accounts is poor form and something @spaminator is on the lookout for.
Cheers!