I imagine it would depend on where home is to adjust cost of living. In the Northeast United States, just property taxes in many areas run north of $1000 a month with a paid off house, and/or rents are $2000 a month to just maintain shelter(not even heated or with electricity yet, or the side necessities such as insurance and a vehicle/transit pass). The Life at Sea cruise was $2500/month with food and drink included and supposedly competitively priced so I imagine deals like this are not too rare. A couple could spend 60k a year easily being homebodies or traveling the world with a staff available for their requests.