I played SO Much Diablo 2 ...  SO MUCH.  I even played on a couple of private realms with user mods.  I really liked D2, but with Vista and Win7 not fully cooperating with my D2 and MH, I pretty much quit playing it, and moved on to other games.  I still feel the urge to play some more D2 at times.  I like Hardcore.  I really like playing some modded D2 on private realms, as using Mousepad's MH doesn't cause any problems on any of the realms I played on.  I did get banned on BNet for MH.  I played for quite a while before I started using MH, so it made finding bosses and stairs less annoying, as well as adding some useful stat tracking.
 
In Diablo 3, I don't expect to use any hacks, at least not for the first few years.  Also, I don't expect to buy multiple sets of CD Keys to use for multiloading/hacking purposes.  I hope D3 is as fun as D2... but I am afraid that if it is, I will waste hundreds of hours of my life playing it, and replaying it.  One of the aspects of D2 i hope to revisit, is the ability to make different builds based on fun skills/item combinations.
 
I hope I don't go into packrat mode like i did in D2 and have accounts for mules.