Pilots tipping line guys?

[JaideBlue]

Hi,
My corporate pilot husband is having a problem with his chief pilot. The guy says he tips the line guys when they travel to different airports, and he puts it on his expense account. Hubby is busy doing copilot thingies, and doesn't get out of the aircraft until after these supposed tips are handed out. This guy has integrity problems, and has lied about various issues before (all of which HR is aware of).

So the question is- DO pilots ALWAYS tip line guys, and how much. Obviously servicing the commode and placing jet in the hangar would "cost" more? What if nothing is done- just a touch and go sort of stop?

I would appreciate replies from the ladies if they have insight!
(and yes, I'm aware that there are spouses of lady pilots in here too- but it IS called JetGIRLS...:p

Thank you!