Sometimes "Upgraditis" gets hold of you and hardware becomes more important than the core business of taking great photos.
Although I'm still definitely more into lenses than bodies.
I started with my "do-it-all" EFs15-85 and 70-300nonL when I bought my 7D (first slr, second digital, fourth camera ever if you count back to my 124-film kodak instamatic). Together, they covered a damn-big focal-length range, probably the best you can get in a 2-lens kit without going the 100-400 or a sigma/tamron super-zoom or two.
Then came the 50/1.8ii. And the lensbaby. And then the lensbaby accessories and optics, the wide-angle and telephoto adapters. Then the Pentacon Six and Kiev 88 and tilt-adapter, and one of almost every Zeiss and Arsenal lens for them. And the skink-pinhole (which i really just don't use that much, probably should get it out more). Then the 70-300nonL wasn't good enough, so sold it and got the L-version. Next up, the samyang 35/1.4, the ef 85/1.8, the Takumar 50/1.4 for the affordable low-light-trinity, add to that the 430EX. Now it's just $2 trick-filters from china via ebay to mount on my lensbaby, as a kind of "withdrawl" from trawling ebay each day for good deals (star filters or soft-focus anyone?).
But now, I think i'm spent. There's nothing left, really (although as soon as I get a job i'm dropping my first Grand on a CF tripod, head, arca-swiss plates and L-bracket), but for lenses that are way too expensive (8-16mm, ts-e24, 200-400, 400 f/2.8, 100L macro and MP-E 65 are on the list behind 1DX and winning the lottery).
But for everything i've bought, even the ones i've dropped $10 on ebay as first bid and ended up winning, nothing overlaps (with the exception of the Takumar 50/1.4 replacing my niftyfifty).
On the bodies though, i'm set. I bought the 7D so I wouldn't need to upgrade for a while, it's only 16 months old, it's got at least that much life in it again, it's not getting replaced until it dies (although it may get a FF sister at some point). There's no other body that i'd need that wouldn't overlap the 7D except a FF, the only advantages of which are the über-shallow DOF for portraits I don't take, UWA can be covered by a new lens these days, low-light would be nice but I just don't use it that much. So no, I don't really need a new camera (although there's a Kiev 88CM calling out to me somewhere...)