Let's put it this way. We have different ways of deciding which kava to buy and drink. We can:
1. Buy whatever is cheapest/easiest to get
2. Buy the most popular "brand" based on online and/or offline reviews
3. Do a bit more research and buy on the basis of advertised chemotype + reviews
4. Do even more research and buy on the basis of advertised chemotype that has been verified by an independent lab + reviews
5. Buy certified (byt TK or any other trustworthy lab) noble and pure products (that also come with a chemotype as well as relative % of different kavalactones).
A quick look at the market suggests that the more picky you are, the more money you might need to spend on your kava.
@HeadHodge 's system is somewhere between 3 and 4. Surely it's way better than 1 or even 2. But it's obviously not as good as 5.
Those who value safety, reliability etc over $ won't be satisfied with his system as there is clearly an even better method of selecting the right kava. However, those who are a bit less concerned about tudei, etc may well consider his system to be a reliable method of obtaining the right kava.