There are those who are collectors who do a little polishing and the job is done.
And then there are collectors that do it like Rick’s Restorations on the History channel. They tear it down to the basics, clean up every piece, and then reassemble it to functional condition.
Todd Harrison has a nicely detailed blog post on how he does that very thing with an Apple II Plus, plus Monitor III, plus Disk II drives (one of which was not working until he did some service on it).
Shows what kind of fun one can have with a couple hundred dollars spent on eBay! Thanks, Todd.