One bad apple don't spoil the whole bunch. As a matter of fact even that one bad apple is useful sometimes. I purchased some apples and maybe it was just me, but I didn't think they tasted all that great. I didn't want to throw them away so I sliced them up and threw them in the dehydrator.
I'm not a real fan of apple chips but dried apple slices can be quite useful in crafting. I haven't decided what to do with them yet though