I think following points need to be considered.
1. All of the new accounts are at level 25, and with lowest steem power possible. 
2. Even if 20 accounts with that level of steem power upvote your post, you practically get nothing. 
3. probably you need to collect all the sbd and steem power you can in all those accounts in order to allow them to grow to the point where their vote can give out something.
4. Let's say I have 25 accounts, I need to set them on autovote, unless I'm totally on steemit 24x7, to gain steem power and get to the point 3.

5. I don't see point in creating multiple account, unless you're ready to put down atleast 2 years to generate substantial amount of steempower. good luck with that.

6. Ignore everything else and start creating quality content. Trust  me when I tell you that it's not easy, but you can achieve it, and once you're there, you won't be loooking back. 

Good luck!! ^^