True. Which is why you need to pick up the camera in person, and should bring a laptop (with a card reader) with you.
I agree with you that buying without having the chance to inspect it first is risky with electronics. You were right not to buy that X-Pro1, I believe.
OTOH; when I bought my Canon 5D in 2010, I paid €800. I sold it again last month for €300. So that camera cost me about €100 per year, which probably is much lower than if I had bought it new.
So while buying used is somewhat riskier, it's also cheaper in the long term, in my opinion.
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