[janh]

Well, a rough estimate but it carries the idea. But now add the resale of software (which in contrast to a download is always a full lost sale), you may get quite different numbers. Just what is the rate (probability) at which people resell their games? If I consider myself, then I'd say I resell about 30% of my games after about 3 weeks (the bad eggs), and about another 30% after a good year or two.

Now, do the math. Surprise? What was it all about...answer yourself.

price (x/1-x), with x= sum or each of {stolen, pirated, resales etc.}