I suppose the thing with busting packets and boxes of NRL cards or any cards is that you don't do it to make money. Every now and then you pull a rare card or low number which can get you some $$$$ back. Everyone wants value for money but that is subjective.
Personally I enjoy breaking boxes so if I spend $200 and get a card or two I need I call that a win even if I could have purchased said cards individually for half the cost of the box.
Back to the thread topic though, the predictor cards were built up to be something they weren't and ESP can't be blamed for this because they delivered what they promised, a gold parallel of the premiers set /20.
I am not sure why the prices were so high, some were certainly subject to shill bidding but more so I think an assumption was made because of the difficulty of completing the set that these would be top notch.
In relation to the dealer I am sure you are referencing I believe that he buys nearly half the stock and no doubt gets a very special price. The bigger issue is that this dealer and ESP aren't collectors and probably aren't concerned with secondary market values and stock dumping, as long as they get their product sold.