It comes down to strain. High yielding makes me think sativa oriented. Takes awhile to flower and fewer but perhaps heavier harvests.
Believe it or not you could make 16k - 20k a year in my locale with a 4 x 4.
Fems or regs? Try something older and less focused on west coast market. There were plenty of yesterday varieties that were cash croppers.
Jack herrer
White rhino
Sensi skunk
Super skunk
Super silver haze
Amnesia
G13 haze
Bodhi has a bunch of g13 hashplant crosses that are regs and could be selected for heavy crop rotation.
Just because people knock each other over for yesteryear hacks does not make yester year strains any worse. Lot's are great and as good as they were. Word is serious ak47 lost a parent and maybe other old strains lost some original selected parents.
New strains have stupid names often. No easily traced lineage. Most are hacks of clones that actually had selection. Otherwise they are pollen chuckers and not real breeding. I doubt people breed much for resistance.
I have some beans of a mother that had little to no smell, and after being dried resembled brick weed. :OLot's of old varieties have bad reps for many reasons:
New growers try those and screw it up plus posting bad pics
Old growers grew the, when they were young and not great growers
Hard core smokers/borderline addicts want the most potent in the world
More oil/hash extraction going on and they grow for resin/oil yields
Fact is green crack is a simple skunk selection. Not everyone wants a 30% retarded stone/high from 3 hits. Not everyone grows only for oil/hash. Some people still want low odor flowers.
If it was great weed 20 years ago it's still great, just not the "greatest" of today.
Fact is some people grow brick weed seed and still get good product because they cared for it very well.
Most people in my community never ever knew the variety of weed they bought/smoked.
For a real cash cropper get MNS Critical Mass- not any of the critical or critical +, real Critical Mass