There's a huge difference in 3 million free downloads and 3 million customers).
I can't count the number of el-cheapo family laptops I've seen where the pre-teen kid has downloaded some both CPU and GPU demanding game just because it looks fancy and their friends do the same. None of them usually see anything more than a slide show, but they count as registered downloaders. Unless they have stolen their mom's credit card info, they aren't paying customers.
Three million flies can't be wrong, toejam must taste good...