Look at what has happened to LOTR and TSPP values. Can't sell them in the 4-5 range at all and these are top ten machines with multiple production runs.
Stern's production philosophy is going to kill the resale. By the time they have finished running them (proper runs or mini runs) the machines (HUO or not) will be almost five years old.
Pros and Premiums aren't going to increase in value until Stern stop running them and distributors run out of existing stock and have customers ask for more. Then you face the possibility that Stern will be pressured into renewing the license "just one more time" (Tron, TSPP etc) from distributors and the cycle repeats.
As for LE values, well I think owners looking for a quick buck will need to hold onto them for quite some time (and preferably NIB). Ideally they should have flipped them off for a quick buck in the first few months after release (if that was your purpose for buying), since now we have a lot of "collectors" who initially bought for that very reason and are willing to sit on their "investment" for a few years and then put it up for sale.
Guess it now becomes a game of Survivor to outlast and outplay the next guy. 
LE Prices (here's an example in the US, 3 NIB BIBLE for sale since Oct last year at 8500 each, they are still for sale....)
http://groups.google.com/group/rec.games.pinball/browse_thread/thread/a97aeea1620e3892/b35f8e6e650a8d65?hl=en&lnk=gst&q=bible#
Yep no one should expect to make money from buying pinballs, unless they buy rare games and keep them long term NIB, still no guarantees though. Pinballs were made to be played
