The cost of sailing?
The book Voyaging on a Small Income is by Annie Hill and is excellent. Beth Leonard also has some fairly recent (90''s) info in her book. We are planning on 1500 per month, but we have a large 43'' and very complex boat (refrig, freezer, bathtub, wind generator, water maker, TV, DVD, ham radio, radar, etc, etc, etc). Greatest expenses are food and boat maintenance. Get a small, simple boat and half that is reduced a bunch. Friends cruise on 300-500 per month. Not counting boat insurance, flying home for Xmas, etc.
If you have any interest in going, and can put 8-12K in the bank, plus seaworthy boat, GO.