The reference to "supercargo" is an old nautical term for paying "passengers" that don't participate in the sailing or managing of the vessel.
It's certainly not unheard of for inexperienced "crew" to contribute toward marginal costs like food and fuel. Just be aware that there are boats that would offer "free" passage in exchange for such services as crew, and there are even some (far fewer) that would pay wages and expenses for such services.
Only you can decide whether this experience is worth that much money to you. At a minimum, you should confirm that the vessel is properly equipped for such a voyage, and that you will not additionally be expected to assist with any significant preparation or maintenance of the vessel.
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Pacific Seacraft Crealock 31 #62
NEVER CALLS CRUISINGDAD BACK....CAN"T TAKE THE ACCENT