I dont consider these PS3 to be "hard" shortages either. There seem to have been shipments all along, just not always enough for demand. Where it would cost Sony is Joe Blow walking into Wal Mart and not finding a PS3 that day. But a hardcore gamer could find one, like my brother found one even the harder to get 120 in the last month with a little effort. Or right now for example stock has been nonstop on Amazon for a couple weeks.
Where does your brother live ? I believe Sony brought in some shipment near end of March (Or was it early April ?).
There still seems to be some brick and mortar availability problems still though. Who knows. I have even heard some message board theories that Sony is either limiting supply to limit losses, or producing just enough to meet demand to give the appearance of a sold out product, and things like that. It's pretty impossible to keep up with, I just go with the numbers. I also think we're at a stage where some hardware or other is almost constantly under shortage. I remember in year 5 of PS2 it had shortages.
I have seen a rumor that say Blu-ray drive supply is the cause.
Most credit the shortage to the new PS3 SKU.
Sony itself flagged the shortage in Jan/February citing that the 2009 holiday season cleared more PS3 than they expected.
It would seem silly to restrict PS3 supply just to appear out-of-stock in the middle of so many big title releases.