for my two cents, which may be worth even less than that since I've only very recently gotten into starting to collect higher end vintage singles, I will ONLY buy vintage cards that are graded. I do this just for piece of mind. You pretty much know exactly what you're getting. It's virtually certain that the card is authentic and you don't have to carry around a magnifying glass and a bunch of other stuff with you to check for condition flaws because a 'professional' has already done it for you.
that's just me though
