Well, since Badj charts are usually slow charts and I'm a flat-eod day trader, and I only recently learned how to create and use them, and now the US indexes I trade/watch have breached their long term Badj price levels, I earned nothing from them directly.
Interestingly, not only did my study of Badj make it into my toolkit, it had me taking a second look at something Hershey emphatically prescribed... de-gapping bar by bar.
My opposition to de-gapping (bar-by-bar) is well documented elsewhere. That opposition is now my past! So back to your question... I now consider bar-by-bar de-gap in my daily trading. It's now in my toolbelt too!! Based on that, the answer is thousands!
FWIW, properly constructed Badj (including bar-by-bar de-gap) charts will render the Y-axis unsuitable, and in many cases entirely unusable for trading from the chart. Of course volume is not affected.

Just saying.