I keep hearing. "If it wasn't for these boards, I wouldn't know x yz". Definitely true for aspects of DCL ins and outs. This is 2017, and we have the entire internet to answer customary or expected etiquette or niceties questions. Heck, I traveled the world before (gasp) the intenet was in common use. There's a thing called guidebooks or travel books to answer all these questions. When I was a teen. I knew to tip my hairdresser and cabbies. I think at this point if we're not seeking out answers to these types of questions , perhaps we are of the mindset of too bad, so sad. I will also bet there are many, many folks who don't even tip the expected gratuities DCL spells out. Some may be feigning ignorance, i think some people just won't tip.
I had two coworkers that cruised DCL and I tried to point them to the site and they wouldn't do it. One really needed the help, or should have asked me questions. They had a gluten free child, I am gf too, and they limited there eating because they were unaware of all the options available too them. A lot of people aren't planners and researchers like all of us, they just wing it for better or worse.