30k/year 300 Destinations

I believe I've now seen three advertisements for different cruise lines that have been retrofitted so that you can sail around the world in a two to three year period hitting over 300 destinations. The latest was a cruise line that offers for $30,000 a year to give you lodging on their ship and an opportunity to even share your cruising experience with other friends and family they'll like to join you for a limited time. If all of your other expenses were eliminated including healthcare, travel, food, and insurance, is $30,000 per person really that much? Could you work remotely and with an average US income enjoy traveling the world?