This is just my personal opinion. I guess having multiple accounts in steemit will not actually matter, why? Because everything depends on your steem power. Having multiple accounts will not give you any benefit, based on how I sees it. Voting power is not also unlimited. If you will notice, there are lots of posts that has $0.00 on it, there are lots of upvote but it didn't add even $0.01, why? Because again it all depends on your steem power. And again :) this is just based on how I see things right now :)