Chris,
I assume you have your tongue firmly in cheek, since this was a major sale of a known collection with lots of associated hype.
Prices would be unlikely to be realistic, you just have to look at one or two other lots to realise that these were probably the cheapest items in the whole sale (and therefore may well have been regarded as a snip) - and most likely sold to someone who just wanted a piece of that particular collection, or else, someone who may well use the provenance to justify an even bigger retail price

.
So, if you want to achieve these prices, all you have to do is make an enormous collection of quality items, allow the publicity to permeate through, keep it for a long time, and then 'Hey Presto!'.....
Very interesting, for all that

Thanks for pointing it out.
Kind regards, Nigel