I don't think my machine has much $$ value, but it sure is loaded with sentimental value.
I have my mother's Singer red eye. She bought it second hand after WWII, and sewed halloween costumes, clothes, slipcovers, and curtains for the home on it...it was the machine she used to teach me to sew back in junior high.
It had a motor on it, but after it started smoking one day I decided that a new machine was in order, so I bought a new Singer. Bleech. Then I began to think how nice it would be to use her machine, so we found a treadle at a yard sale and put it in. It sews perfectly and it's fun to use - and I don't have to worry about setting the house on fire. For a long time it was the only machine I pieced with.
Since then I've acquired two more electronic sewing machines, a Viking Sapphire and a Bernina 430, but there are days when I still prefer to use the treadle. It gives me a peace the other machines don't.
Janet