After following this thread for a few days, I decided to weigh the next bag that I opened. That bag happened to be opened today. Some Shincha from Thes du Japon (this was my first order from them, so it happened to be fitting that I weigh this tea). I placed my tea tin on my scale and zeroed it, then filled the tin with the freshly opened bag. I am happy to report it came up as 99.7 grams!
My acceptable range is 0 to 1 grams. Don't get me wrong, if I buy 100g, I expect to receive 100g. The 1g acceptable margin has more to do with my scale. If I had an expensive, accurate scale that was calibrated everyday, then I likely would be upset over 1% of my tea missing. That isn't the set up I'm dealing with, so I'll give the vendor the BOTD up to 1g