I have had all of my cameras overhauled at one point or another. An overhaul means the body gets cleaned out, old solidified lubricants are replaced, the door seals are changed, the shutter calibrated, film transport cleaned, and a host of other items looked at. If you have a camera with the older 1.35v button cell, the repairman can recalibrate the meter to accept the newer 1.5v button cells. Wein cells are OK, but they die quickly and never at a convenient time.
Like a car, you can drive one without maintenance, but it may not be as reliable as you want it to be. Mechanical camera experts are thinning out. You might not be able to find a competent one in a few years.
I think $130 is cheap insurance, and your camera will last for years afterward.