Let's rephrase the question just a bit... Is it worth sailing 2000 miles to save a couple hundred bucks? If your bottom is foul, you might just end up burning that much extra
fuel.
You will find good yards in the Chesapeake, and mediocre ones. You can find good yards in
Grenada, and mediocre ones. Having just run through quotes all up and down the
east coast from
Annapolis to
Florida the quoted
price for the same job varied by about 15% from the lowest to the highest--after we threw out a few that lowballed the price by not quoting what we actually asked for.
If you want a job done right, even at the best of yards, you have to be there to supervise.
Bottom paint is not rocket science, but the surface prep has to be done right, and the recoat timings and time to splash can matter. If you are not watching, you don't know that the manufacturer's directions were actually followed. When we request a quote, we request in writing that the product's directions for application be followed exactly.
Having had
work done in both places, I would do it where ever I was when it was needed and was convenient.