Yes, you can definitely vote for yourself. I've done it a couple of times.
It's usually pretty difficult, as you have to log out after every vote. Not to mention that it's a complete pain in the butt to find yourself in the first place. ^_^
To make things easier, you should switch from server to server to see which server voting list you'll show up the most in. Different servers have different user percentages; in other words, you might show up often in one server and show up rarely on another [for the band lists].
When I do this, I open a couple of tabs and log in my accounts on separate tabs. Then, I go to the voting area and watch the top part of the voting list, refreshing through the tabs as I go. If I catch myself, I vote and log out and log in again, etc.
I think that votes done by a wider variety of voters gets more "count" than does votes done by select people. I don't know; those are my thoughts, and I highly doubt it's right. Thought I'd just throw it out there for you guys to chew on.
You're completely welcome to correct me, so don't be afraid to ask any questions.