Dakota, if you look at somewhat older boats, the difference in price doesn't seem to be that great. I did a quick search on 2hulls.com and found:
2002 Privilege 45, $430.00.00
1999 Privlege 45, 285,000.00 Euro
2000 Privilege 42, $270,000.00
1997 Privilege 42, $320,000.00
And on multihullmaven.com:
2005 Anatres 44, 299,934 pounds sterling
2001 PDQ 42 (essentially the same as the 44), $226.636.00
2000 PDQ 42, $212,686.00
These are roughly comparable boats from each manufacturer and while I cannot speak to inventory or condition, one of the Privilege 42's (the 2000) is listed for only about 57K more than a PDQ 42 of the same vintage; and the 45's, while a bit older, bracket the price of the PDQ Antares 44.
You have to bear in mind that a much larger number of Privilege boats in that size range have been built and that the PDQ is virtually unknown in Europe
; since more people are familiar with the Privilege it shouldn't surprise that the demand (and hence re-sale values) are going to be a bit stronger. Furthermore, as has been mentioned, the fact that PDQ went out of business would also tend to cause concern in the minds of some potential buyers.