My biggest gripe (happened on NCL) was be forced to purchase plastic drink glasses for $1.00 each that I didn't want. In theory, you purchase your first drink, get the glass and then purchase refills throughout the rest of the cruise. The drawback is that you have to carry the glass with you in order to qualify for the refill price. If I had wanted to buy plastic drinkware, I would have gone to K-Mart.
I kind of agree, on the Victory you purchased your first drink for 6.00 then the refills were 4.00. We bought a new one everyday and only came home with two of the glasses cause I didn't have enough room to pack them all in.
I have the same gripe about being forced to buy the souvenir mug when buying a Coke card. I read on these boards that you can refuse the mug and just buy the card at a reduced price, but on my last 2 Princess cruises (aboard the Regal and the Sapphire), they would not let me buy the card without the mug. I had no use for the mug and it ended up being lost before the cruise even ended. Not a real big deal and the Coke card was still very reasonably priced, but it would have been nice to have a choice.