I have bought three FWs.... one in England for my daughter, with the British 220 current, and two in America. She left the British one with her mother in law when she moved back to America. Now I have one American FW here at my house and the other at her's. It's there for me to mend with when I go there to visit-- she doesn't really sew on it much. I'd like to say I use mine but I just don't. Once I got my 301 I really didn't need the FW at all. The 301 lifts right out of its cabinet and is lightweight and portable, only 4 lbs heavier than the FW. So it goes places with me. Still I haven't decided to sell the FW.
I really think they have peaked in their price (several years ago, actually), but what's the harm in keeping it? Maybe put it on display somewhere? Someone may 'grow into it' in your family and need a very simple machine to learn on. Or perhaps a friend might need one to borrow. Although there are millions of them out there, it's still kind of a novelty. Keep it.