One of the most successful entrepreneurs in agriculture may never plant a single seed. Whenever people talk about making money from agriculture, the first advice is usually; "acquire a land and start farming." But farming is only one part of a much larger agricultural economy.
I agree with you on this point because I’ve seen it myself, the marketers who go to the farmers and get farm products and bring them to the cities or even export them to other countries often make a lot more money than the farmers at last.
Before food moves from the farm to your table, it must be harvested, collected, sorted, preserved, transported, processed, packaged, finance and distributed. And at every stage of that journey, there is a problem waiting for someone to solve profitably.
The farmer produces the crops. Who prevents the produce from spoiling? Who transports it to other areas? Who processes it into a higher value product? Who supplies the machinery? Who connects the farmer to reliable buyers?
Every step in the transportation and processing of farm products are potentially profitable in some cases, you just have to figure out which works with your skills better. And that doesn’t mean there are not some farmers that also make a lot of profits from their farms.
That one of the most exciting things about agricultural businesses, even delivering the finished products is also very profitable and a lot more of them as you’ve already mentioned some.
Every form of agriculture requires money and over the time, I've alway known that the level of our profit in Agriculture depends on how much we invest in it no matter the area we choose to focus on and yes I agree with the op that, those making the actual profit might not be planting a seed but I think they might even have to be also spending more money to run those services like transportation, preservation and processing which we all know it's always an expensive process.