Okay, maybe not 15% but how about an automatic $2 added to your sign and sail account?
I mean, seriously, isn't the whole idea of auto tipping to take the hassel out of it?
Why can't they just add a tip to any extras? Spa, room service, ect?
Obviously, passengers not using these services would not be billed. That's fair isn't it?
And in the spirit of making it easy?