Perhaps I wasn't clear. Obviously you're growing and then pressing, and not having to purchase the material. Does it cost you less than $40 to grow enough to produce a gram of rosin?
Last time I attempted to run the numbers, I calculated I would need to harvest six pounds a year to keep up with my rosin intake, assuming a 15% yield and pressing flower. When rosin was $70/g here it made sense to purchase the equipment to grow/press, but now that a gram is half that I just don't know. Of course growing/pressing your own is more satisfying, but my wife might not view my satisfaction as worth the outlay on equipment and necessary space.