By this logic, doing anything yourself is inefficient and a waste of time.
However, I think that by reducing it purely to a monetary number, you are not measuring things correctly. Part of the output of doing DIY things is the knowledge, experience, and fun that comes from doing it. If you insist on putting a dollar sign on that, I’m sure it ends up being much more equal.
Can I agree with both?
One one hand it's a fun DIY project for some people.
On the other hand, every other year somone rediscover vertical farming that makes no sense except for very niche products.
I think you missed the part where I said I built the same system and enjoyed it and learned a lot from it.