Viper, the reasons are simple.
The projection is attempting to make a known element for the calculation in an economic climate where such projections are wildly innaccurate(look through any industry recently and see how far their projections swing from reality), to add to the problem with the projection there are not enough existing similar patterns to use as a basis to follow.
As a gauge to measure their guess they relate it to another area of the market, but as that area acts differently normally and even more differently under an economic downturn then as a gauge it is pretty useless.
Plus of course a large portion of those transactions completed are of a type that would not be part of a normal pattern and as such would have no precedent to make a forecast from.

Really? They are no worse than the last bunch of idiots you had in office over there

Thats funny, it was the muppets on silly credit and buying in an artificial boom that are the ones getting screwed.....thats the ones that believed the economic nonsense from the last administration.
As none of my properties have any mortgages on them there is no chance of me losing them.
As I have said before, I will not be buying more property until the market bottoms and more of the muppets who believed the hype have been repossesed.
Its hilarious when some neo-con tries to tell me about investment