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AFAIK, you can only subscribe to "explicit" smart lists, the ones that have an icon in the Marketo UI left column.
You probably hit a bug that allowed to create the subscription on the "member of smart campaign" though. You may want to log a ticket to support.
Thanks for the post. I just did this exact same thing. Considering this post is almost a year-and-a-half old now, I just wish there was a better answer. I think it would be convenient to create the subscription on the "member of smart campaign" (with the ability to manage the subscription in the subscriptions list) without needing to create a whole other smart list. If it is a bug, I wish it is a bug that Marketo builds on rather than removes.