I understand completely!
I passed on my backup machine to a friend who was ecstatic to receive it. Sometimes I do still wish I had it, but it would just be sitting there not being used, so what would be the point.
I also have a treadle machine that so far I haven't done anything about getting a belt for. As far as I know that is all that is needed to make it fully functional. Right now it is sitting next to the table I have my FW on and serves as an extended space for large projects. Really came in handy when I was hemming the edges of all those yards of velvet for the draping at the Scarborough Faire booth. So it's not totally useless!