No. CPB doesn't own anything, and it can't sell DVDs. This is their budget:
https://www.cpb.org/aboutcpb/financials/budget/
If you see DVD income there, let me know.
There really isn't any money in podcasts. Its just another way to get content to the public. They're not going to replace $445 million with podcasts. It doesn't add up.
Well I noticed that for some reason somebody else brought that up. As far as I know its the person donating to local PBS affiliate or Local NPR affiliates doing that and the member outlets can do whatever they like with the local funds though as long it meets the non-commercial/Public Media criteria for the local outlet. And like you mention CPB is mainly a middleman for the stations for funding.