Re: Savage Worlds
Same here. Unlike, say, D&D, the core rules haven't really had a ton of changes over the years, and most of them are for the better. I'm currently running a game with the older version of the Shaken rules, but that's in place specifically as a Setting Rule to make that particular game harsher.
There's talk of a new version of the core rules coming out fairly soon (probably in the next two years), which I'll certainly look into, but the Deluxe is mostly an expansion, rather than a rewrite, and I can use older stuff perfectly well.