Lol- if you had some of the embroidery attachments that fit the 15, they are worth over 10x what the machine is.
I hit the jackpot the day I picked up a well worn 15 in a cabinet - and in the drawers were both a two thread and single thread embroidery attachments, along with several other harder to find attachments. All for $37.50. At the time I had no idea what they were selling for, but knew anything "embroidery" was usually big bucks.
Got home and looked the two thread up and was surprised to find what I read as $128.00 - only to relook and realize it was $1280.00.