Just because games are downloadable only doesn't mean there won't be piracy.... Look at DL only PC games.
Unfortunately, there is a stigma against piracy among the hardcore gaming community who wish to see the end of it, but no dl only service is an answer to that.
Patapon 2 is one of Sony's biggest franchises, so it makes sense to experiment dl only with a high profile game that people will end up downloading regardless of personal feelings about the issue.







