First off, I'm tight with my money, but never hesitate giving a tip to my barber, waiter, etc. My question is regarding cruises. When I booked my cruise, I selected to prepay gratitudes fro my wife and I. I wanted to make sure they got paid, and was easier for me to budget money.
I can understand tipping a porter and a bartender at the time of service, and throwing a little extra to those who were exceptional, on my last day. If for example, I was sitting with table mates, and they tipped after a meal, and I did not, would I look cheap? Am I expected to tip some more at that moment as well?