Yeah, mainly because discs have always been cheap (even in the 90s, CDs cost pennies) so they made a ton of all the popular games, and the PS1 sold well enough that that number was big. For 1, the fact is the PS4 is powerful enough to emulate via software (as we've seen). I don't see how security plays into it. As long as they can verify it's a legit PS2 disc (and given that Sony has the patents on the copy protection, I can't see that being an issue) there shouldn't be a piracy issue. Unless you mean people will use it as a workaround to softmod the console. But even then the methods are pretty well documented that they could find a block for those exploits.