Often, I do not have a full copy of the home inspection in the file as the previous buyer's agent only sent along those portions of the inspection that were pertaining to the defects that were written up in the Inspection Notice from the buyers. That is, normally, what I send along to the seller's agent when I have the buyers - not the full report.
Plus, the home inspection is for the buyer, but if they decide to not buy the home because of something in that report, the report was pretty valuable of itself. Once the buyer moves on will they ever really need that report again?
I have seen buyers give the seller the report for free and move on and I have also seen them sell it to them. It just depends on the buyer.