one big problem with that conspiracy theory is that... well, who makes more pentium mbs than anyone else? right, intel does
the new contacts are actually fairly similar to what most motherboards already used; all that basically happened was the pins were removed from the CPU, and the plastic grid overlay was removed from the CPU socket. just removes a couple points of failure when the contacts are now like 1mm apart.
and previous motherboards weren't intended to handle too many more insertions either. how many times will any non-reviewer remove their CPU? once, maybe two or three times max if their CPU comes out along with the heatsink... though i don't think that happens with socket 775 anyways, but been too long since they were introduced for me to remember.
if initial yields were that low for everyone and nothing could be done, AMD would no longer be in business - their profit margins are razor thin compared to Intel's, pretty amazing how well they've done selling far less CPUs at 10-20% of Intel's profit per cpu