Have you ever seen an ice cream boat?

For the 4th of July I went to a beach on Cape Cod where people pull in their boats and anchor them right in the sand.  And whereas many beaches you might get an ice cream truck that shows up to take advantage of unsuspecting generous parents, in this case their was an ice cream boat:

The ice creams sold for about $3 each.  If they cost the vendors $1 a piece, they'd have to sell 100 of them in order to make a $200 profit, not even counting gas and other expenses.  And considering it was a two man crew, "ice cream boat worker" doesn't seem like a very lucrative position.

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