It's not as easy as it sounds to make a lot of money with ginseng. Although wild root prices bring fair prices most years, this year the market has bottomed out at $500/lb in our area and buyers aren't even buying at all. It's illegal to hold roots over from one year to the next and so the diggers with roots on hand will have to take the best price they can find, even if it amounts to getting almost nothing for the work that went into digging.
If you do plant, make sure to plant in a way that the roots will be considered wild when you dig them. This is called "wild-simulated". If you "cultivate" the plants, the roots will not look wild and you won't get as much for them when you dig them. Also if you grow wild-simulated, you'll have plants of various ages in your beds and when you dig you'll only be digging those old enough. Five is the legal age, but the roots aren't really big enough then and it would be better to wait ten or more.
Just to give you an idea of how many roots it takes to make one pound, it is about the amount needed to fill a bread bag or around 300 roots if they're small.
I have a lot of info at my blog on ginseng and have published a couple of books on the topic if you want to take a look: http://www.wildozark.com/grow-american-g...