I personally think BOTM is pointless.There is no stable rating.Everyone can nominate themselve.It is pointless.
Again, a rule that exists at vBulletin.com.
The idea is that people who are proud of their site can submit it for seconding, regardless of any other factors (save having won it in the prior months' competitions).
Also, currently, not Anyone can nominate themselves. vBulletin.org staff may not nominate their own boards under the current set of rules.