Do all gray dealers inspect out of warranty watches internally before selling?

[Rolexnavi]

I don’t mean a one year old watch….I mean like a 10 year old watch. Do most dealers inspect these internally and open the watch up to make sure everything works properly before selling or is this abnormal?

I’m looking at a watch now where the dealer says their watchmaker does this on all watches before they sell them. Just making sure that is normal or abnormal?