I know for a fact that CCBILL does not sell their members database and neither does IBILL.... I have used both processors for over 3 years... even signed up for my own sites to make sure they don't do this kind of shit, and they don't ....
It's an easy test... just setup an email account specifically for a test like this... if you only receive a join and cancel email from the billing company to this address then you can be fairly certain that they do not sell their database :-)
If you start getting emails from anybody else then it probably means that they are selling the db.....
Just my 2 cents worth....
Terry
www.projectvoyeur.com