If you actually made a point rather than trying to be a dick, I might be able to address it. Why would the game not have any replay ability if you had an offline mode that was admittedly properly written rather than just shoved in to appease people unhappy with the crap servers?
Im not trying to be a dick but just like every time a disagreement happens on this forum people just ignore huge sections of the post they're arguing against. I wrote my point quite clearly in almost identical sentences in two different posts and both times that sentence was ignored by both people arguing against it.
But for the sake of clarity, here it is once more.
In D2, Blizzard included an offline mode. In that mode, it was impossible to play the game as it was played by 90% of people then and now, as it was impossible to replay quests. Once you'd played through the game, the game was complete and the only progression was to then enter Open Bnet which was... imperfect.
As a result, and despite the protests of that other guy, in my experience most people played on the Blizzard servers, as THAT is the mode that made the game the item grind it is. It allowed replaying bosses, re-running whatever sections you wanted until you got the drops you wanted.
It didn't exist in offline mode.
Also i will expand on why this affects D3, which i hadnt included before.
There is a reason they wont add it to D3. Because when you have an offline game the character information is saved on the End Users machine, not server side. That means it can be found and edited, as evidenced by the thousands of D2 Character Trainers, leading to the uselessness of Open Bnet that i previously referenced. Even if they DID make offline mode identical to Online, people wouldn't play it repetitively because whats the point? Why spend hours and hours grinding when you can spend seconds editing the character info on your computer.
And that's pretty much it. As i said before, Offline Mode in D2 is a a working model of why it would fail. It either wouldnt allow the grind, as in D2, or if it did it'd be redundant.