While I was recovering from my accident my flat bar road bike made like easier. I could use it on the widtrainer and later it was the first bike I took out to ride on my own as it was easier to control.

Not a great reason to keep a bike I know, but I would also lend it to a friend if they were in the same position as well.

Oh and there is also a point where you won't get much for a bike (it is usually if the bike is unusual or not popular) and you would end up almost giving it away- so sometimes it makes sense to hold onto it until you find a better option or a buyer who knows what it is worth.