I download pirated movies, music, software (to a far lesser extent since I switched to FOSS) for all of the above reasons, but as a content provider myself, I must mention that it's not as easy as we would all think to have simultaneous global distribution. Here are the problems:
1) Registration of copyrighted works. This takes a different amount of time every time you do it, never mind in every global jurisdiction. With advertising being so expensive, and/or so time consuming, we want the product to drop as soon as it's advertised, which leads me to point
2) Global advertising. If I advertise on a website most frequently visited by people in my country (Canada), there are certainly people from other countries around the globe who will see these ads. If those people want my content, and they are impatient (as I am), they will want to pirate the content in question rather than wait for it to appear in stores. This, in and of itself is not such a problem, as all content providers want to reach as wide a fan/user base as possible. Nonetheless, I would say with almost absolute certainty that if someone (myself, at least) ALREADY has a pirated copy of the content, they have even LESS motivation to buy the legal content than they originally did. In a best case scenario, a friend will come over to your house, watch the pirated movie, and want to buy it because they don't know about bittorrent.
3) Manufacturing and shipping. If I make a movie, and want to get it into theatres, no problem! Make a couple thousand copies, and send them around the world. Once they've arrived, release the movie everywhere at once and millions can be made at the box office. When it's DVD release time, however, I must make MILLIONS of copies. Now what? If I contract the work out to a single duplication service, they will take months to make that many DVDs (because they have other clients, and even major film studios with in-house duplication have more than one movie to print at a time; think about back catalogs alone). Since I've advertised the hell out of my movie, and this advertising is next to worthless six months from now, this is not an option. That's not even taking into account that shipping times would delay the release in many areas of the world. Option 2 is to contract the duplication out to regional companies (which almost everyone does). I can't set a specific release date in any area until I know when they're ready to ship, and yet even this will vary from region to region. Perhaps in China my movie is not as popular as in Canada, so the duplication house is prioritizing larger clients ahead of me, which delays release there.
There are only two ways to achieve simultaneous global release with the above problems in mind.
1) Wait until every single aspect is in place to release. This could take years. It's ludicrous. As long as I have a product ready and it's sitting in a warehouse awaiting release, I'm losing massive amounts of money.
2) Forget about physical media. I'm sure we'll get there someday (probably soon), but for now, even with piracy, physical media is still making money, and I can guarantee that stopping all production will not increase digital sales, It will just prevent people who don't know how to download (legally or illegally) from buying my product.
Now, all this aside, I completely agree, as a consumer, with every point in favour of piracy. As content providers, we need to have BOTH simultaneous global DIGITAL release, AND the standard, staggered physical release. Meeting the needs of ALL possible customers only makes business sense.