A nice thing about open bar is you don't have to finish one before you get a refill, particularly with wine; they come by with the bottle and top you up. It has also had the wonderful effect of having all the lounges filled before dinner and it's quite a social event.
On the SA cruise they have loaded up on wines from the countries we've visited and it's amazing how good it is from some of the obscure wine producing countries like Peru & Uruguay.
Caviar free always at SSS cocktail parties and sometimes at breakfast, otherwise $$$.
Cheeeeeers,
Jim