All cpus should be locked the same as all cars should be fited with tamper proof fasteners so you can't make them any faster. If you want a faster car you should buy one.........what a load of nonsense. I have a P166 that has been running at 200mhz since I bought it from new. I am pretty sure Intel has never lost any sleep nor much revenue from my having overclocked it.
Half the fun of owning a computer is seeing how much performance you can squeeze out of what you have. If you blow up a cpu, well it's one more chip the manufacturer gets to sell to replace it. Factor in all the idiots who fry theirs in the process of hamfisted overclocking, I'd guess they actually make money from overclocking rather than losing it.