Well, people are allowed to make money, as long as they are not cheating others to do so. That’s how we get better goods and services at better prices – free market competition. Normally when the government gets involved in something (like your growing tomatoes example), their intervention adds additional expense to the final product. As long as no party is being coerced, let people figure it out on their own without the government.

You mentioned a “closed system”. I interpreted that as one free from government intervention. I think most libertarians would support that.