I don't understand why you ask a question, get an answer and then disagree with everything everyone has said?
It's really irrelevant what other figure you have or don't have, the 12" GB figures cost what they cost. Consider all the accessories and smaller parts that are created and added to these figures. The Michael Jackson example you gave has no accessories so therefore is cheaper to make, produce and to sell. I'm sure the other figures you've listed are in a similar situation.
Now don't get me wrong, I personally do actually agree with you that they are overpriced so therefore I haven't purchased them. I also own a couple of 12" non GB figures that cost less than these and are in my opinion better likenesses and overall better produced, but these figures were purchased years after their original releases. When they were first available at cons and online they were $100 plus, $40 more than the GB's, so again, I didn't buy them. Over time the prices dropped into my range and I picked them up on eBay in unopened boxes. Maybe your best hope/bet is that in the future you can pick them up lose for a lower cost or maybe in the long run the value of them will fall to below the original price tag. If what you're asking is “where can I get these brand new collectables which are widely sought after for less than their retail price?” then the answer is….. no where.
I might go for the 2 packs when they are released as it works out at the same $60 for the single figures but with a bonus amount of accessories, to me, that seems more reasonable.
Anyway, this isn't to cause any trouble, it's just my response, even though this is the market place and I'd hoped this thread was about someone selling 12" GB figures.