Ok so now that I have your attention I'd like to talk about preventative maintenance of a garage door. There are a few simple steps you can take to keep your garage door in tip top condition.
Step 1: Only use WD-40 on your garage door hinges and tracks.
WD-40 is a water based lubricant developed for nasa.... NASA people, need I say anything else?
Step 2: Never run into your garage door with a car or forklift.
This step requires brakes on your vehicles. To often we are in a rush to get in the garage after a long day at work and accidentally hit our garage door. This can cause enough damage to your garage door that it may need to be replaced.
If your door is installed by a qualified professional and regularly lubricated you should never have to replace it.