Where am I pulling out numbers? I don't see anything. If you really believe a person who knows what an R4DS is and knows how to use it, then that's your opinion. I don't see anyone else supporting your idea or theory.
Underestimating? Answer this question:
According to your data. Do you believe 13 million DS owners have an R4DS?
Underestimating? Answer this question:
According to your data. Do you believe 13 million DS owners have an R4DS?