While I do not pirate myself, nor do I condone piracy in any way, the BSA and all their reports are complete hogwash. They operate on a false assumption that every pirated copy of something out there is a lost sale. This is not the case, as most folks who pirate stuff (software, movies, TV series, etc) cannot actually afford to buy them - at least not in the quantities they pirate stuff.
In short, the BSA are working on what is called "perceived loss" which is very different to "actual loss". Actual loss? Probably less than 1% of the amount of piracy.
As a side note, I think they charge too much for movies and TV series, and shouldn't charge at all for software. I'll gladly buy a box set of something, but please, it doesn't cost R600 (minimum) to produce that box set!