Only if you would normally use ALL the amenities with a mass market cruise lines...

For starter, the land excursions are 100% to 200% inflated priced.

The liquor is a cash cow of the ship. There is actually a documentary on an NCL voyage that the cruise started out at below-target revenue (based on booking as the ship did not sale full) and ended at just break-even profit wise for a large part due to liquor sales soared towards the tail end of the cruise for whatever reason.

So for DIY folks the all-inclusive package does not work at all especially if one does not want to travel with a tour group. For those who dont drink or only drink very moderately, the all-inclusive price is making these folks to subsidize those who drink heavily...

Tips on Mass Market Lines generally are $12 per person per day for suite occupants, and $10.50 to $11.50 per person per day for ordinary cabin. The service is no less than the high end market. The cabin attendants and the waiters / assistant waiters earn very little wage and their income rely on the tips from the passengers - that virtually guarantee you would get much better services than equivalent setting on land (hotel and restaurant landside).

As for airfares, one can either do an add-on as cruise-air with the mass market lines, or do the flights independently. I would strongly recommend people do it independently because even the high end lines DONT use regular tickets but "consolidator" tickets which can be a nightmare if there is any IRROP. Cruisecritics board has a forum specifically for Air and there is STICKY on why Cruise-Air is not a very good idea unless there is a huge price differential to offset the risk which varies on itinerary / destination, needless to say. Some itineraries you have no choice - such as Amazon cruise - that you must use cruise air because only Charter flights fly to the embarkation point if you dont do a round trip from US but choose to do only one-way - you either need the charter flight to fly down or to fly home.