Thats actually another 50% up in quantity, if its from 20 pcs to 30 pcs.
Perhaps some price drop for this if theres more quantity added like what Entropy suggested?
But frankly, I think you should keep the edition no as you intially planned, like what you usually do:
"It’s been almost 3years since I made this type of figures.
Once I decided I made 20ea only, then I kept my word so far. Even couple buyers said they could have pied more, I have never took it."
Since theres also the head + clothing set, and also the clothing set etc if anybody missed out on this. As far as I remembered, a couple of people who were interested in getting the full sets intially initially like buttmunch etc has decided to change their mind to getting the head + clothing set.
My 2 c.