Hey, "profit" and "usefulness" are not merely economic terms, so hold onto your dreams, even if you need to get a so-called "real job" in the meantime. Tea is not yet hugely popular here, but it is growing. Some facts:
Tea is the world’s second most popular beverage after water. However, in the United States, tea trails water, soft drinks, coffee, beer, and milk, making it the sixth most popular beverage.
Over 80% of the tea consumed in the United States is in the form of iced or cold tea. However, tea consumption in the US is growing rapidly.
Sales have tripled in the past 15 years, exceeding $6 billion dollars. Of that, the high-end or Specialty Tea segment (including loose leaf teas) totaled $1 billion dollars in 2006, or 4 times the 1990 figure, with annual increases thought to continue at 10-15%.
Here 2 tea industry links:
Good luck on your admirable quest!