Trying to answer your first question, I personally do both. I sell individual ebooks on any given subject, as well as packages, but I also promote any service I feel valuable on my websites, blogs, or in newsletters (if your service is not like the Chimps, who hate affiliate promotions)..
as far as legal, of course it is legal to promote plrdatabase… aside from individual policies from certain mail providers
As far as your affiliate link you created, I believe I have done something similiar before and it worked. Could it be you were logged into the site, and that is why? Not sure how or why else that would happen.
Plan Your Life In Color!