Is part of that being up to date on the talk so you can sell the products?
Yes. It's very rare that old editions remain available, and I'm not the kind of store that goes deep on "collectable" versions of out-of-print things (other than comic books) because I don't like asking high prices for things and having them sit around (not even on the comics - I ask reasonable prices and sell them quickly, use that money to buy more, repeat).
So I tend to sell out of old editions (including my own copies, which I would sell rather than keep), can't source more for what I would consider a reasonable price, and just carry the new, in-print thing. I it's what I have, it's what I need to show people and play in-store, so there's just never any going back.
I'd sooner avoid personally playing a game at all (leaving it up to others) if I don't like it, rather than "compete" with the available product by playing an older version.
This honestly goes for in-print, but more "niche" games as well, unfortunately. If it doesn't sell regularly, I just can't take the time to play it, even if I'd like to. I can mitigate that a
little by pushing something small that I love, but if the customers don't bite - I have to move on.