Given the price you quote (unless you've missed out a zero) this has to be a used instrument, so the question can't be answered in the abstract without knowing something about its condition and history. Again given the price, it's likely to have been through several wars and need quite a bit of work, which may or may not be worth it. Incidentally, you may not know that Yamaha now own Bosendorfer: and although the original Viennese factory is still going strong and instruments still being built to the original Bosendorfer designs, in the half-dozen years since the takeover Yamaha influence is increasingly showing itself in details and in quality control, and far more than that in the recently-launched replacement for the big Imperial.