When I first got home internet access, there was suddenly much less need for me to keep buying OPS2, because all the info I'd read already online. I still bought it if I liked the look of the demo disc -- but now that we have PSN et al, there's no longer any need for this; we can just download demos. Plenty of people might not have their consoles online, but surely this number can only decrease?
How often do you buy games magazines? Does the portability outweigh the rapid information decay?