If the blades are sticky and stuck, and you wind on and can't fire the shutter, the wind will also lock until you can free the blades and allow it to fire.

If you like the feel and handling of the camera and can bear with the low contrast (or tested the black square trick) then yes $70 is not a bad investment if it goes toward a competent and reputable repair person. But if you only bought this at the swap because it was dirt cheap think twice about if it's really for you. Also some cameras just love to break and cause photographers headaches, be it design flaws or materials. Research a bit and see if this camera is worth your while.