It can be, but as far as I know there's only one official site to vote on that gives you credits - http://servers-minecraft.net/server-minehut.1049
You will need to link your Minecraft account to your Minehut account first, though. Go in-game and do /vote for a better guide!
But yes, it can help Minehut even if a little bit, and if you have your account linked, it rewards you 10 credits.