2 out of 7? That's nearly 1/3 of your collection. You're okay with 30% or so of your toys to be defective right out of the box? Maybe money isn't as tight for you as it is for me, but that that's just not acceptable. At all. So, yes, it is a major concern with me. Which is why, as a consumer who does not get to buy as many toys as I'd like, that the toys I do buy actually NOT be defective. Others out there may be in the same boat as me, which is why it is important that other fans are educated on these issues.
As far as the 0D, I have hopes that, even though Yamato won't be making one, that there will be a kit a fan makes here to convert an 0A or something. I've seen some pretty amazing customs here on the forums. I've got my hopes up!