An ex-colleague of mine who worked in IT for BA had his removed for 'inappropriate conduct' on board. Reading between the lines of what he told me, and knowing him, I suspect that he was strutting around as if he owned the aircraft and trying to impress the girl he was travelling with. He got into an argument with the CSD who reported him and the rest is history.
Other reasons for withdrawal of privileges can be for attempting to manipulate the reservations or inventory system to ensure that there will be seats available when travelling on standby. As this involves loss of revenue I would consider it to be theft from your emplyer.