For the money it cost to create and publish that ad, they could have made at least 50 or 55 more copies of Panzer Dragoon Saga and then the game wouldn't be so super-r@re.
The issue isn't even that the game is rare so much, they printed 30,000 copies which is about average for a domestic Saturn game (the initial print run of 6,000 and then two runs of 12,000). The issue is more that the people that own the game aren't selling their copies.