The number of downloads and discussions about bandwidth and potential bandwidth are irrelevant--unless you're assuming that every illegally downloaded book gets sideloaded on a device? And if you are ... WHY are you?
I just sense a lot of convenient "apples and oranges" going on. Illegal download counts (and bandwidth consumed by such) isn't really directly relevant to the number of pirated ebooks being sideloaded on devices, is it? How many downloaded illegal books never make it onto a device? Is it possible that some dabblers download entire pirated collections for a handful of books they ultimately end up keeping/sideloading?
Your "point" seems to be moving around a lot. I can't quite nail it down. I'm just going to assume that the point is: "some people pirate, and some people sideload." It's not very relevant, but it's concise!