All stated below in one lowly BP'er's opinion, but...
The SOP shares this with TH:
It is big. It is expensive. It has been a slow seller. And, for retail shelf space and retail storage space prerequisites, this thing is a monster.
Also, think about the appeal of the set; it doesn't take much to appreciate the aesthetic beauty of the Tower Bridge, Taj Mahal, etc. Imagine Lego putting out a Seven Wonders of the World set, Roman Colliseum, etc.- with true universal appeal. Big pieces and prices would not stall many from purchasing, were they serious admirers of those relics (of which there are many). The SOP isn't at that level. I would rather have a 4,000+ piece 7-Eleven, Slurpee machine and all, than this set.
Last week while at the Pick-a-Brick counter of my local Lego store, I blind-folded myself and grabbed seventeen handfuls of beige and white brick pieces. Using just these blocks, I was able to replicate the Lego SOP with a statistically-significant 93.567% accuracy equivalent (P value of <.05).
Should TLG have wished to honor the fine country of Australia, they should have (I have said it before and will say it again), done a UCS Kylie Minogue.
But who cares about the aesthetic/artistic appeal of one Lego collector? Would this piece adorn my Lego display section? No.
Will it be included in my investment portfolio?
Yes.
Like the TH, the more elusive the set disappearing, the more lowly the QTY stocked by fellow investors, the more iconic the set (regardless of its artistic monotony from one collector's perspective), the greater the likelihood of post-EOL appreciation. This set will always have an interested audience to some degree.
When Harry Potter hype fades, and when no one really cares about Lord Business's lair in many, many years, there will always be some Aussie or tourist who saw Crocodile Dundee Live at the SOP and must have this set. It is an extremely significant historic building.
There will be a long-lasting demand for it. And thus, it will be allotted its appropriate space in my Lego investing portfolio.