Did you hear about the viticulturalist whose crop was lost in a drought? He said his whole reason for being was to pay off his raisin debt. (I'm still workshopping this one.)
Howsabout "He said his whole reason for being was raisin money to pay his debts"? Though the punchline is similar to the previous comment, if you're trying to avoid that.
Even if the demand for grapes dries up and withers on the vine, at least you won't have a problem raisin money.