A bike is worth whatever a seller and a buyer can agree on. If you think that $275 "feels" high, offer $200. Whatever number they counter back with, offer to split the difference. That's what that bike's worth. Tell them that money in their hand is worth more than an unused bike taking up space in the garage.
If they stick firm at $275, you'll be no worse off than you are now.
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My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.