I recently downloaded an entire game, several gigs. The Delta Sector, a stand alone game that only requires the Farcry installation disc to run. Free, legit, incredibly detailed, and in my opinion even better graphics than the original. It would probably sell like cold beer on a hot day if put for sale. All the authors wanted was a thank you and recognition.
He's padding his portifolio. See <insert company name>, 100,000 downloads x a hypothetical $50 bucks a pop - KACHING! Am I hired?