You did an amazing job on the Pfaff!! It looks perfect!!
Interests do change and evolve over time but you should really take your time if you are thinking of parting with some of your prizes. This has happened to me too, where I will become really passionate about finding/collecting a particular item and then after the hunt is over my interest wanes and I move on.
Some "collectibles" can be hard to come by and many are getting more difficult to find. Once when I was considering getting rid of a pretty treadle parlor cabinet that doesn't have a machine, just to get it out of the way, a friend warned me that I will get a bit of space but once it's gone, it's gone and I may not find/or be able to afford another if my inclinations return - I've had the cabinet for a long time - maybe someday I will find a machine to put in it.