If it works, it's worth keeping until it dies. It's not worth fixing unless you can repair it yourself and you particularly like the machine. It has plastic gears that crumble eventually. You can buy the gears for about $60.00, but that's just for the parts.
The first thing that goes is generally the gears under the bobbin winder. If it will wind a bobbin, and you feel generous, donate $5.00 or $10.00 for it.
I actually like to sew on the Touch and Sews. I have one working one left. I've had it since it was new and I might try to repair it when it dies.
bkay