Throwing an hour's billable time in the deal for no cost doesn't impact the salesman's commission, it's just good business. The tech gets paid if he's billable or not and if you don't interrupt billable work it doesn't cost the dealership anything extra. When trading in my X23B I gave the dealership the hitch (upgrading to a 5th) and my brake control. Sales guy said that they could use "free hitch or brake control" to sweeten the deal for the next buyer. I got what was, to me, a good price and the dealership was easy to work with so I let that stuff go.
2013 F-350 CC SB 2WD 6.7PS
2013 Eagle Premier 351 RLTS
-SOLD- 2012 X23B
-SOLD- 2003 Ford Expedition 5.4, Bilstein shocks