Yeah, I think you're right. I'll add a page listing the types of tea likely to be sent (with a description of each, as you've suggested).
I plan on sending teas like the organic Long Jing Dragonwell tea. Depending on the number of subscribers that month, I'll likely take a loss on many of those teas since the tea and associated shipping costs may exceed the $24 monthly price.
I have to reach a certain threshold of monthly subscribers (with a fixed churn) to reach profitability.