We vote with our dollars when they release a title for them to release additional volumes, but if they don't release what we want to buy,then how can we vote? :)
I say write the studios - a real letter,NOT an email would make a bigger impact than a Petition.
It may not make much of a difference,but one letter in hand is worth more than a name on a petition - it takes effort.
Petition DON'T Work - especially on line ones! The studios and "powers that be" arn't going to care if a few hundred,or even few thousand people sign one.
They know the interest in each and every one of the titles they own. Just because there are *ahem* copies going around doesn't mean...