Have to admit I went a little crazy with camera gear. Had a 5D MkII and bought a very lightly used 1D IV for sports. Then they announced the 5D Mk III and it had exactly what I wanted. A better focusing system that improved the quality of my shots because it did get better results. Was happy but a friend put a bug in my ear to trade in both for a single 1D X. Well I sold the 1D IV (in about 2 days) and took the plunge. Problem is I haven't been able to pry the 5D III away because it just does somethings different and IMO its a great all around camera.
So here I am, with two great camera, always convincing my self I need to sell one but, I never do.
As to how I afford it. Well as others have said, I don't drive a fancy car, don't own a boat, and I've only taken three vacations by air travel in the last 35 years. Have to admit I hope to take more in the future. So its a matter of priorities. One vacation = 1 1DX IMO.
I''ve been in love with photography since I built my own darkroom 45 years ago. Now I can finally afford the equipment I always wanted. Which I spent more on gear when my kids were growing up. Scanned 500 rolls of negatives that I took with relatively mainstream film SLR's and lenses and wish I had that to do over again but I at least I do have them.
My recommendation. If your passionate and want to make the leap go for it. Don't regret not getting the shot you want. That said you don't need a 1D X to get great shots. Love my 5D III as well and when I had my previous DSLRs each one was a great new experience as I move from G1, to XTi, to 50D, to 7D/5D II combo, to 5D III to 1Dx.
And you know what, the new mirrorless,like the Fuji X-E1 I'm using open up another horizon. A high quality camera, with changeable lenses, that I can take with me when I need to travel for business. With todays gear there is no real limit on what you can do or how you do it.
If you want a 1D X, can fund it and still meet your obligations, do it. But don't lust after it and put it ahead of other real world priorities, health, happyness and financial security. (The soap box is yours now)