Then is it okay to pirate software too? For instance, is it okay for me to pirate all the apps from Mac App Store since I didn't steal any physical copies?

I never said it was ok to do so. I also never said that nobody gets hurt by not paying. I just said that they weren't the people that maeon3 was suggesting and that saying that pirating the movie hurts everyone who was in some way involved in the production, distribution and sale of the DVD, but thats simply not true - the people involved in the production, distribution and sale of the digital version may be hurt and some of those people (certainly some of the people in the production) will be the same people, but the analogy is not anywhere close to being correct.

Anyway, people who are pro piracy will tell you that yes, it is in fact ok to pirate software too. I'm not saying I agree or disagree, just saying that the hardcore pro piracy people do not find anything wrong regardless of what is being pirated. They will also disagree with the term "piracy", but whatever.

is it okay for me to pirate all the apps from Mac App Store

Sure, why not! My most used "app stores" are the Linux package managers and everything on them is free, so not paying for apps doesn't mean that availability will be affected. No, I'm not saying I think its ok to pirate, but your comment does read as pretty disingenuous to me.

In any case, so many people share music, movies and software all the time without thinking about it, maybe its the businesses who should be adapting? If yesterdays business models are failing, instead of trying to shoehorn them to work through laws and regulations, maybe they should adapt? I'm personally involved in a music industry startup and we're doing exactly that - piracy is promotion to us. I'm also involved in other software things and spend a lot of time talking and thinking about game development and my conclusion is that piracy can largely be sidestepped in all of these markets by... adapting the business model to be piracy tolerant.