Thoughts and Notes Ideas that stay with me long enough to get written down

Free Content on YouTube boosts (really boosts) Monty Python DVD sales

According to Can Free Content Boost Your Sales? Yes, It Can, Monty Python's DVD sales have increased by an astounding 23,000% on Amazon since they made all of their content available via YouTube.

I find the logic correct, but can those numbers be correct?  23,000%  Sounds fishy to me.