I am suffering from burnout at the moment myself...
Like you, it is more related to 40k than anything else. I still think it's a fantastic game and I enjoy playing when it happens... but it happens far less often than it used to. I am in the middle of building several armies that have basically stalled since the yearly price hike combined with the insanity of their releases lately just took all the joy out of it for me.
Instead of a hobby it feels like a duty... another mortgage payment I have to pay in order to maintain the momentum I had happily built up while things were less crazy.
Honestly I couldn't tell you if it's the price of everything doubling in the few years since I started playing, or if it is the rate of release and the mass amount of nonsense they keep tossing up for the frothing masses. Collectors edition what now? And it's how much? And there are twelve different ones? I'm confused...
The cost of a rule book and codex together is more than I've spent on rules, decks and two crews to play Malifaux!!
Maiifaux has kept me going though... there is something refreshing about a fun, unique game with fantastic models that I have always enjoyed. But combine that with the lower overall price of entry and I am finding that joy in gaming again. Buy a rule book, buy a crew, go play.
Sadly I'm still looking for folks to play with, as most around here have never even heard of Malifaux.