I think it's a really good idea that craft coffee lets you order a tasting box.
Maybe that would be something that would give you a higher margin and show users the quality of your service?
Also I think if you subscribe to teapeat it would be great to get access to some associated content.
Either a little video, podcast showing how to brew it, details about it. That would build a great community that keeps coming back to the site which would result in better upselling opportunities.
Currently you get people to sign up and the only time they might come back is to cancel!
Build a community of tea lovers & hold onto them!