i dont think sob stories really are a dime a dozen unless people are just making up crap. i dont know, when i look at my friends and classmates, they all came from nice backgrounds, with no hardships. so for those who didnt have it so lucky, i dont think it is a cop out. the key is just to do it effectively... and of course the adcomms have heard it all before, but honestly, i dont even know if the ps matters that much. i was just thinking about my undergrad interviews...and how nervous and prepared i was for those, and how little they probably mattered.
oh well, good luck everyone.