Your numbers are way too high.
POTC was 6000 units.
TSPP was 5900 units.
LOTR was 5100 units.
We know this because Stern released the production numbers.
Others are way, way lower.
I have it on fairly good authority that ST has been the highest selling game (after LOTR in 3rd place) and that it's done close to or just over 4K.
AC/DC was supposedly around the 3K mark ... if they'd done 10K, you can absolutely guarantee they wouldn't go for the prices they do. The market would be awash.
AC/DC could of course have done way more and run for years, but Stern couldn't reach a license renewal agreement with the band('s legal representatives).
Re: GB, I don't think it'll be anywhere close to ST or AC/DC, because production has been severely hit during the period where it's hyped up and should be selling like hotcakes. Instead we're getting people (the world over) cancelling orders left right and centre due to supply and quality issues, and a bunch of people are selling it either due to difficulty or unrealistic expectations. That and it's the last DMD from Stern, JJP supposedly have around 2K Hobbit orders, and the Lawlor game likely launches at Expo ...