Why is ncl Considered the nickel and dime cruise line

I'm bee. reading a lot of reviews i'm about how You will be nickel and dime to death on ncl cruises . We picked this cruise because we like where was going and fit in our budget. I didn't really like carnival at all because it's a party curise royal caribbean seem to be more about kids Ncl seemed to fit better with what we wanted.I wanted to do celebrity at first but found it Expensive and for older people