Imagine selling bottled Europan water. Fiji, move over. That would help fund the mission, and no more battles with environmentalists over Nestle taking too much out of the aquifer etc. of course, that's assuming the Europans won't object.
Joking aside, something like this actually could be used to fund space missions. I suspect that some people with hundreds of millions would be willing to pay top dollar for something as exclusive as an item from Europa.