judging from the ratings AMG S2 is receiving in japan and (possibly the DVD sales) it is highly probable that there will be a season 3. From wad i know the viewers currently watching AMG S2 has already exceeded that of season 1 in comparison so we can always hope for the best

Does licensed dvd count as dvd sales?

Well if there is season 3 then thats good...just keeping making them heheheh ^_^

What I meant is does every DVD sales count to making new seasons or is it only Japan-bought DVDs sales that count to making new seasons?

They count,, ALL of them

thats good even thoe it would be nice to see how they end it I'm glad theres a good chance of more coming out.