1 pound per plant can be done standing on your head. In fact if you can't pull 1 pounds off a plant indoor, your skills are novice at best. The problem I see most people facing is impatience and improperly designed growing areas. With 12 plants a grower should easily harvest 1 pound per month dependent of course on strain selection. This can be done in any choice of substrate. The key is large pots for single plants and 90-120 day veg times to fill the net of a 4 x 4 tent. The grower must commit themselves to 6 months per plant. In hydro this time can be reduced dramatically. In the end it comes down to room design and patience in order to reach these yields. The current format I am examining uses 12 plants per 4 x 4 in hydro and is a super-fast way to get 16-20 ounces per harvest from a 4 x 4 in 9 weeks from an 8 week strain under 600w. The drawback of course is the high plant count. We must all realize that growing requires much time and money invested in order to reach the premium yields and and qualities so many other growers around the world obtain. So far as outside plants go, I regularly see plants that exceed 10, 12, and sometimes reach 15 pounds per plant. I would feel like a complete failure and stop growing completely if I was forced into production levels that I have seen discussed. In the end it all comes down to the ambition of the grower, the knowledge possessed by the grower, and the ability to combine both in order to maximize production.