While I don't know if we are a significant number or not, I'm one of those collectors/enthousiasts that didn't live through the VCS era.
Seconded. I was born in 1981 and was still in diapers when the VCS peaked, and by the time I joined the first grade and started thinking about video games, NES was the talk of the schoolyard. I didn't have an NES growing up but got plenty of exposure to it at friends' houses where I developed a healthy nostalgia for it even if by just watching others play.
One kid across the street had an Atari 8-bit computer and I distinctly remember the CX-40 style joystick, and my elementary school had some computers (I cannot for the life of me remember what company made the PCs but the graphics were ugly super-saturated 8-color and all we had to play were typing word and number games), but everyone else passed off PCs as "edutainment" junk. NES had far better graphics than most early/mid 80s computers, and pre-crash consoles might as well have been buried dinosaur fossils for all we knew.
So I only exposed myself to Atari decades later by reading up about much of the lies spread about it on the internet and though to myself, "It can't really be this bad, can it?" In spring 2012 I finally got my first Atari and also read the book "racing the beam" which gave me an appreciation and understanding of the hardware (in layman's terms) which I carry to this day. I really fell in love with the system and the homebrew community surrounding it, which lead me to the conclusion that nostalgia can be had by experiencing anything from a former time, irregardless of whether one had past memory associations or not.
And a lot of senile AA members disagree with my opinion that "nostalgia can be experienced without a memory reference" but if myself and others younger than I, generation Y to millenial, with little to no experience with a medium (in this instance Atari), can experience a child-like wonderment in playing these old games for the first time, then there is something more transcendental going on with retro games than simply reliving one's childhood.
Same goes for spinning old vinyl on my turntable and appreciating a period of music during which I was not alive, like Janis Joplin, Jimmy Hendrix, Led Zepplen I, II, III, IV, ect. Still don't care for the Beatles though, probably never will...