I adopted a similar strategy for Tomotcha: we pick/sell only one tea each month. Most of our competitors send several samples each month, and from a revenue point of view maybe it's better, but I like the ability to give focus to a single tea.

For instance our next shipment is a Genmaicha: it's a combination of green tealeaves and roasted brown rice. The first time I drank Genmaicha I didn't like it much, because it's so different from what I was used to drink. But now I love it. You have to give each tea a try: if you just drink small samples you'll never develop a taste for the more complex ones.