yup, I've got a pretty nice base model 71 GS 350 that i cant seem to get decent $$ for. then there was the 71 GS350 4 speed on here that was having trouble selling at 14K or thereabouts.
My opinion is that until the aftermarket embraces the SBB I cant really see the 350 GS's or Skylarks moving up in value. I still love the SBB but over the years of what I see its just not what many people that "Invest" in these cars want. Without demand price won't increase.