Guess I'll offer up my two cents.
A tobacco pipe is an instrument made for smoking. While it should be aesthetically appealing, or pleasing, it's main function is to allow one to smoke tobacco. It should do this to the best of it's ability, and should not impose any nuisances upon it's operator, if used properly. These pipes look like they'd be a hassle. A hassle to smoke, and a hassle to clean.
To me a pipe loses a great deal of it's total value if only seen as a piece of art. Sure, it can sell for $50,000, but if it isn't used then its nothing more than an object on a shelf. I could make a concession of sorts, if the sentimental value were equal to or greater than that of it's monetary value.