Intel has always had relatively high prices. They have been bringing them down lately in the face of stronger competition from AMD. They are a corporation, the goal is to make money. If you don't like paying the high prices, fine, don't buy the chips. Capitalism at work - nobody is forcing you to upgrade your machine. The reason that Intel has changed formats is for technological advancements - switched from the Socket 7 to Slot 1 to get the cache on the chip vs. remaining on the motherboard, which made for speed improvements; switched back to socket when they were able to put the cache inside the chip which made the processors cheaper to produce (and passed savings on to you). Switched to a new socket for the P4 so you would need a new motherboard - P4 would be horrible if it was starved with 133FSB on the GTL+ bus, instead of the 400 MHz FSB it has now. And they recently made the switch to a different socket with the P4 to make it cheaper to produce - an adapter should be available so you can use the newer chips in your P4 i850 motherboard (according to Anand)
MS is already a monopoly in the OS market, few dispute that. 2000 and XP are very stable. Renting this OS? I don't know about you, if your talking about the activation thing, and you don't like it, again, don't buy it.
This is only a quick post, many other arguments for liking them exist.