Because my personal yield, without spending $100/crop, is enough that one crop lasts me a year. If I spent that extra hundred bucks maybe it'd last me 14 months or something, but that wouldn't help me much. Winter is the best time for me to grow out a crop (because the heat is easier to deal with), so a crop a year is perfect for me. If CO2 would allow me to grow TWO years worth, that'd be worth it to me, but I am verging on a gram/watt now, and I don't believe that I will ever be able to double that, no matter what I do or how much I spend.

I have never heard that CO2 affects the amount of time until the trichomes are ripe; it just makes somewhat larger buds, but they take just as long to ripen.

And I never said only dealers can grow large, heavy, quality buds. I grow large, heavy, quality buds myself, and never sell anything. I merely said that $100/crop isn't necessarily worthwhile, and especially if you aren't making money off it. If your needs are 100 percent taken care of ALREADY, without the extra hassle and cost of CO2, then spending that extra hundred bucks a crop gains you nothing except a lighter wallet.

I also don't really want more than a years worth at a time; pot only keeps so long, and slowly loses potency over time. Even if I could harvest two years worth at a time, I wouldn't want to. And should I ever be busted, having less than a pound around probably looks at least a little better than having 2+ pounds around. (A pound lasts about a year for me.)