In fact, I don't see why not to release games via torrent - especially these games which don't have any DRM.
Look at the "real" picture (as I see it, if I am wrong, then someone *who really know and who is not just repeating several lines, strike back

)
1) Most programs / video / music - everything you can convert into ones and zeroes - will be released over internet in unofficial (read pirated) way. You can slow it a while, few days, a week - and then it's over. There are too many talented people out there who *will* broke through the protection. And the protection itself can cause troubles. Look at Sony DRM.
2) All CD/DVD copy protections have one bug which is rarely discussed - sometimes these protections "find out" you have pirated CD/DVD, even if it is clearly original medium, and absolutely new, just bought. Probability is low - but then, there are *milions* (OK, several grades more) CDs/DVDs released, so the actual volume is pretty big.
3) Why should I have to insert my CD/DVD every time I want to start a game? How many programs have same policy? Photoshop? Windows? Yeah, you may laugh as much as you want, it's sily to have Windows CD/DVD in drive every time you start a system, isn't it? Why games are so different?
They have keys. Similar system as Stardock use and I am glad for that. I really believe it's the way it should be. It gives you more freedom. When I buy a game I don't want to keep the DVDs in the drive every time I decide to play it. I want freedom of movement, to use software I bought (or licence for a software, as it is sometimes) where I want / need it.
4) Copy protections are often nasty (look at the end of the reply to see how I know - in person) and can even damage your PC (at least StarForce can). And they are not cheap. Do you think they give you their protection software for free because your game is sooo gooood? It's another expensive software. Developing games is serious business, and most times very expensive. No real need to add another expense which will make your target community like you *less*.
5) Bandwidth issue.
Yes - bandwidth is not free. You may have read in news on this very page that StarDock *bought* additional bandwidth for this month. OK, so you are releasing a game without CD/DVD protection *and* without DRM. In fact, releasing through p2p network like torrent can be cheaper! Of course, people still download from you - but they download from each other too, so in total, you spend less GB of traffic. Remember, all these people still need serial key and you are not distributing it.
Think about it - the first thing "pirates" will do is that they will search p2p networks like torrent, emula, direct connect, name it. What if the first and most relevant link they find is *official* and not cracked game? Do you think they will all download a crack later? Sure, some of them - even most of them - but the rest will buy a key. A key. A key that is, compared to whole program, very short and can be distributed with very little expense on company's side. If you want an example, look at Anarchy Online - the only way how you can download it from official site is through torrent. Yes, AO is free, but you can start paying monthly fee for added content.
The only question is, how many *more* people will buy your game when you allow people do download it over p2p. Look at it as very cheap advertisement.
Closing comments:
Author participated in developing several games, so he is *not* noob in this field.
As a matter of fact, when he got, among payment, DVD with one of the games he was working on, it contained StarForce "Copy protection" - right after installation of this product, his DVD burner stopped reading ALL DVDs, even under another operating system, in another PC, and after attempt to "fix" the DVD burner with latest firmware, it stopped reading even CDs. Author wants to thank those nice people from the company he bought DVD burner from for replacing DVD burner with new model.
Author works in software company and is paid for it, so he does not encourage piracy, he knows how hard it can be to develop good software.