Great idea
if you can spare the time do it!.
There is only so much of this stuff around and I think in a few years time a good collection will be one or two SAs. I mean someone once said to me "invest in land, they have stopped making it now" and its the same with this stuff.
More and more people want this stuff and less people want to part with it. So IMO if you get the bug with a few bits you will want the books.
