Buying a Leica so you'll have something to talk about seems a bit much. But people buy things -- including cameras -- as status symbols all of the time.
Buying a camera as an investment only makes sense if you can flip it for a quick profit and then reinvest the money either in another camera to flip or to put the cash into some other type of investment.
A camera as a long-term investment is usually an "iffy" proposition because the market can be finicky. What's hot today can be surplus goods tomorrow. You should buy it only if you can pick it up very inexpensively -- less than half of its market value, I would say.