Living on a boat
will have many of the same costs as living ashore.... food
, travel, etc. It's just that they are different values.
You don't drive the car to the market and load up on groceries and store them in a huge freezer
... you shop at the most accessible market to the dock/shore. Local prices will be different wherever you are.
If your boat
is in good condition maintenance
should not be too bad... like replacing an engine
... etc... or even a winch
or a sail. .. or a huge bank of batteries
These things do require maintenance and reach the end of their service
life. These costs are to be expected. The maintenance and operating costs are directly related to the size, type, condition and age of a boat, where it is sailed and how hard it is used and how well it has been maintained.
use depends on how much motoring and genset (if you have one) use. Food
also depends on your palette.
Assuming you want to do more than steer, stand watch, eat, sleep, clean and maintain... you may have variable expenses... for *tourism* or entertainment and of course where you are cruising.
Long and short of this... is that there is no one size fits all budget
I suppose the issue is that people want to cut the lines and live aboard and cruise
and need to know in advance that they can afford the lifestyle.
Count on it costing more than you imagined or planned for. ;-)