Jester makes a great point, pick-n-pulls, or salvage yards aren't everyones cup of tea. Being able to just get "a/the" part whether it's at an Autozone store or the stealership, can be the largest part of the battle. Of course, some parts you don't want to get from a salvage yard, that is unless it means the difference between actually throwing the car away or keeping it from the inability to find that single part! You wouldn't want to buy used brake shoes, or radiator hoses for example, because even though our ford dealers no longer carry these parts, they're readily available through parts stores, and will be for many more years to come.
If you lost say the use of a drivers door handle or latching mech. even though you'd hate to replace it with another tired out one just like it, you hate it more to have to throw the entire car away now just because you can't keep that door closed. Of course the days of the Aspire are coming to a close pretty soon. I liken it to the bygone era of the chevette, chrysler's K cars, the Fiesta, or the game "musical chairs" lol.