Johname,
I think you hit it on the ball with the use for the site. I don't believe in this matter that letter quality plays a big factor.
Letter quality for me means that there is a "possibility" that there are end users that will purchase the name. With higher letter qualities, the doors open to more and more end users willing to purchase the names since the probability of the letters matching something relevant is higher.
In the case of PVOD, although the letters are not all premium. Letter combination plays a factor. 'V' may not be a hot item.. but 'VOD' is certainly. Video on Demand is a very hot item and will be even hotter in the years to come. As well, since PVOD from everyones perspective has the use of being 'Porn Videos on Demand' then everyone knows the purpose to the site and the acronym relevance is known by everyone.
So the question now becomes, how many end users would want to purchase the acronym for 'Porn Videos on Demand'. I would say that would be a high number in the porn industry.
So hope this helps elaborates the name and keep the good evaluations coming.
- Bob