Ghostcrawler responded recently to a post asking about stat growth on items, and the results were pretty interesting. The player asked if Blizzard had any plans to cut back the stat growth on items before we reach +2000 spellpower, for example. GC had this to say:
Well, sure, but what about in Cataclysm? With all those stat changes you guys talked about at BlizzCon, there has to be some surprises on the way when we see our first glimpse of Cataclysm gear."They're just numbers. We don't think it starts getting scary until the human mind literally has trouble processing the digits. If your new staff has 152,420 spell power, well, yeah that's a mouthful. But if your new staff has 4000 spell power, the only thing that can really be freaking you out is that 4000 is just a really big number compared to the 100 spell power you might be used to. Automobiles used to cost hundreds of dollars instead of tens of thousands of dollars too.... :)"