I have voted :
" Prices are down because of all the great new machines coming out "
and it seems to be into the majority trend , WOZ come into the market ,some title in UK will show up , the Stern titles from 2000 to 2006 are more affordable as price range,,, high end buyer will buy Metallica at 10K
Bottom line : people with money will go to new machines ,middle buyer has almost disappeared , so sellers have to lower prices to the low cost buyers from entry level .