Jenn,
I have about 3 main campaigns, and everyone, no matter what list or optin form they come from, goes to one of these campaigns.
but I also create a unique optin form and list for each product, that way I can send them the 1 (one) download email for that product.
But they stay on the main list.
I purge my list of non-opens from time to time – I don’t do it every 30 days, but probably should . . generally do it sporadically when I feel the list is getting bloated
Sean