Here's what people fail to realize about Macs: Because their casing is aluminum, the whole thing acts as a heatsink. I should know, because I own one, and run it at full capacity, using nearly all 8 gigs of ram rendering and converting HD video (the whole thing's casing becomes a furnace, but at least the computer's insides don't overheat).
Also, I just love how most people here are only concerned about the case and fail to look at what's inside. I'll probably never own one myself, but do you see any other company doing this thing that Apple has come up with? No. Why is that? Because, in the world of consumer electronics, Apple is usually the first company to try something new, and most of the time, it works and becomes successful. So don't hate it yet, guys; soon enough, other companies will follow suit.
And so what if it's just to make a ton of money? They're a big company in a major industry, it's what they do, people! You, the consumer, decide whether or not you want to buy it.