A few bags are. In fact I see about 1 lb of dry mushrooms in the large Ziploc bags, per bag (so less than a grand per bag). These are the close up bags on the washing machine or whatever.
Most of the bags pictured are full of substrate and water. (The lawn and on the shelves).
Additionally, cubensis, the mushrooms pictured, are easier to grow than button mushrooms. If not for Nixon’s war on hippies cubensis would cost about $5 a pound (or $50 a pound dried).
Not that it wasn’t an okay sized operation. Each of the other bags pictured would produce a couple ounces dry pretty easily. So eight of those makes a pound.