[zdragnar]

Something as simple as adding a stick of RAM might be worthwhile, but some upgrades will take more money in salary (you and the person whose computer you're working on) than the upgrade is actually worth. This is especially true if you replace several components one at a time in a what would otherwise be a single replace cycle.

This is especially true if the business is writing down the replaced hardware as depreciated capital, compared to say simply adding a stick of RAM.