I agree, it makes little sense, and without understanding someone's requirements, how do you justify calling them 'plain stupid'?
On the contrary, constantly upgrading CPUs for little to no benefit to one's own requirements is likely a waste of money, but not stupid. A while back, upgrading a CPU might have yielded a reasonable improvement in performance, but with the frequent socket changes of late, unless you picked a fairly low-end CPU to start with, you're not likely to see much of a jump on the same socket.