Not all tools become worthless as soon as they see some wear and tear, some even become more useful after they have seen a lot of action.
Sometimes there are jobs that don’t have tools designed specifically for them. A common example is removing tightly fitted brackets. Often when this issue comes up, there just isn’t a specific tool that will fit the specific slot that needs to be pried open. This is where worn and old tools can be of great use.
Because these tools are worn they are often blunt and less obtrusive to work with. This can be great when trying to avoid damaging the thing you are working on.
It can be worth keeping a selection of worn tools handy for jobs that may seem to be tricky or something you are perhaps not accustomed to. You may be surprised to see what you do with old tools.