€3200 for France <-> Baltimore, 13 day trip. But with that you get three meals a day, a decent looking cabin, private bathroom, private balcony, and internet service (though how solid the connection is / what surcharges there may be is a question).
~€250/d doesn't sound too bad, and you could get work done along the way. Kind of sounds nice...
https://www.voilasailcoop.fr/transatlantic/
https://www.voilasailcoop.fr/transatlantic/transatlantic-a-b...