I'd have to agree....600-1000 should do what you want it to do. I could see someone going to 1200-1400 if they were bored and a bit reckless, however 2000mg a week is just ridiculous and very likely pointless.
I love it at 400-700. I used a 1000mgs for awhile and was peeing 12 to 15 times a day because that stuff swole up prostate. The positive results didn't make up for waking up 3 times a night to pee.
I saw a guy on a different forum run 2 grams of primo in a contest prep log. He looked outstanding. I wish I could run it that high.
Cost isn't an issue with homebrewing. I just can't handle high doses of anything. Prostate issues and insomnia keep me from running it higher than 600 mg/week.