What logical rules? A game is not a house because you don't get to keep the house for free if you say you don't want to pay for it. With the game, if you decide not to pay for it, you still have it. There's no incentive to pay for it. The "logical" rules you're talking about don't work when it comes to digital products.
Think outside the box... for example, let's take sins... put sins on a torrent site, so distributor will not have to pay internet band for diffuse it... you can use it freely but if you wish online game or upgraude, you need to buy a serial...
What about single player games? If the only way to make any money is to make people play online, then you're going to end up with crippled single-player campaigns with all the effort going into multiplayer. And once that happens, people will feel the need to pirate multiplayer and use private servers because the smaller single-player focus will be "crap".
This is sort of the trend now in PC gaming. The publishers have started to agree that online-only games with strong user authorization are the only way to make money in the PC market. That's not a good thing in my mind. I like single-player games.
For some product, it is possible to apply a hire system... software for free but you pay in function of how much you use it... again, some serial and internet connection needed... already some distributor use a similar system...
That would require strong DRM, and everyone (pirates and nonpirates) go on and on and on about how much they hate DRM. Legitimate customers would hate to have to constantly log on to the internet and have the game track the amount of time they play. I know I would hate it; I'd much rather just buy the game and have it. Plus, this would be fairly easy to crack.
Why game cannot use a system like some of my professional 3D software... a short time free trial and the software is blocked until you buy a valid serial for activate it...
Professional 3D software is MASSIVELY pirated... almost every home user who uses it has a pirated copy. The 3D software companies make their money almost entirely by selling to other businesses. Business software is easier to sell, because other businesses don't want to break the law; they need to keep records of their expenses and be able to enforce their own copyright when they make art or games.
But in game terms, what you're describing is a demo. There are lots of games with demos, and some that have timed trials. They still are massively pirated, because the pirates think they shouldn't have to pay for the game at all because it's "crap" and "buggy" and "half-finished", or that it's made by an evil greedy corporation who deserves to be stolen from. I thought the whole thing you were arguing against (at least what most pirates are arguing against) is the entire concept of having to pay for games. If all you want are more demos, then maybe you should ask the companies you like to provide them, rather than stealing their products.
You see, a some solution already exist for digital products... the thing is that distributor need to adapt to the digital world... never, the digital world will adapt to them... for distributor, maybe we can return to the stone age... book carved on huge stone was not easy to copy !!!
Well, they ARE adapting. That's what DRM, online-only, and moving everything off of PC and to the consoles is. But pirates don't seem to actually want them to "adapt", they seem to want them to give away everything for free.