Hmm, I never had problemes with DAZ yet. Just true, the forums are for members talk only but there is a support-mail site for questions and help.
Poser7 stuff you can buy here at ReRo too ;-) There is no need for DAZ Producs as long you doesn´t want to use their figures.
As company DAZ has to close a account if someone asked for it. But you can open a new account if you feel the need. 
I guess when your account was canceled your purchase list has gotten down too. So you can´t order a CD now.