The duplicate subscribers issue is something I hear so many people talk about. Especially when people are trying to pitch conversion from Mailchimp to ConvertKit. However, you don’t need duplicate subscribers. You can do 1 list with groups for each product. That’s how I do it and save a boat load of cash. Drip looks awesome, but it’s more expensive than Mailchimp, when Mailchimp is used with 1 list and groups.