I'm sure that Carrara 6 won't be $1.99, even to platinum club people.  Daz may deeply discount Carrara 5 after 6 comes out to get people hooked, but hell e-frontier just gave away Poser 5 recently for free.  The $200 is probably cheaper than what the upgrade will cost once the product is released.  I also know that Daz is working on the issue to have all the Poser functionality back in version 6 without involving e-frontier.