I flew a TLV trip once where both Captains and both FO’s were on greenslips. The other CA did not order a meal just drinks and ate the huge appetizer spread the restaurant put out. When the bill came told the flight attendants to put away their money. 3 of us covered everything. The other CA paid for his drinks only. Had a HNL layover once where the CA was on a GS and found a 100 dollar bill exiting the hotel. Sunset drink tab was 86 bucks. He paid for his two beers only. He got ditched for dinner!