Wouldn't it be great if herbs had different levels to them. You know so that if you picked a herb, from I don't know a widly walked area it would have less strength to it. Then it would be cheaper most likely to buy, but the only way of finding out if the stuff is good is if you tried it out yourself. It means that I could have this conversation.

Tarquin: You got the stuff
Hedwig: Yep all'ere one grand o'weed
Tarquin: Hmm How do I know its good?
Hedwig: Try it yourself
---5 minutes later---
Tarquin: hehehe
---hands Hedwig the money---