I felt like I got a little attitude from a couple of servers when I got used the little drink tickets last year. Don't know if they cause them more work or reduce their tips. Maybe they are valued at the bottom of the range.
I suppose with the bar cash program you don't have to worry about whether the beverage falls into the proper prince range. It could apply to a bucket of beers as easily as a bottle of wine.
A Bad Day At Sea [with power] Always Beats A Good Day At Work
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, 2014, Caribbean 2013, Coral 2014