The ironic thing that no one has mentioned yet is that if you went to conventions in the 80s/early 90s - practically every Golden Age, Silver Age, and Bronze Age key was obtainable and 'got away.' I can remember MANY conventions in the 80s where dealers had tons of keys and if you stayed around until 3:30/4:00 - the dealers would start to slash prices. However, until prices started to really jump in the early 90s - I never remember seeing really 'High Grade' gems...
I was remarking to a friend the other day that when we were younger - we "knew" that this hobby was going to take off but we really didn't "know."
Though I look back with some regret with everything that I sold off, I know that if I take the potential financial benefits out of the equation, that the comics I owned provided thousands of hours of enjoyment and escape - and there is no way to put a price on that. It really was a fun time to be 12-16 and reading TMNT, Fish Police, Boris the Bear, and X-Men, Watchmen, The Dark Knight, etc...and then discovering Miller's run on Daredevil and other great stories from the past...