Are we talking smokeable or non-smokeable? If a pipe is so over-smoked, the bowl is over-reamed, cracked, and disintegrating,
maybe. Most pipes are smokeable, and tradable, for cash or credit toward another purchase. I've given a few to a friend former-smoker
who wanted them for decor for his pad. I've never out-and-out pitched one in the trash. If a pipe is smokable but not to your
liking, it might make a glove-compartment pipe. I wouldn't expose most pipes to the heat and temperature variations in a car,
mostly, but if you're not concerned about the pipe, it might be a back-up. Like most of the respondents here, every pipe seems
like an old friend, "my favorite" while I'm smoking it. Memories and reveries. A number are gifts. Some are by carvers I know
face-to-face or by reputation. So, don't bother going through my trash looking for pipes.