We compared the numbers: all balconies, everything included except for grats, booze (wine & beer included with lunch & dinner - don't care, don't drink), a couple of upcharge restaurant "experiences" (not interested).
Included: coffee/tea in the cabin, Every port has at least one included excursion (nothing fancy), snack/soda/water in cabin (except for the 2 cheapest categories). WiFi is included.
Large bathrooms with real showers and heated floors. A balcony that's big enough to sit on without squeezing.
Benefits: No casino, no kids, 900 passengers.
When we finished comparing, the cruise we booked was only a couple of hundred dollars more than a comparable mini-suite. If you only want to book inside or OV, you won't save $$. Balconies and above are in the ballpark.