This is like taking a vacation to the big ball of twine vs Disney Land because you can't afford it.
That is a terrible analogy. By comparing space exploration to vacation you are suggesting that the science has no value other than to satisfy someone's curiosity, which is simply not true.
A better analogy: Going to Europa is like a manufacturing company investing in a robotic production machine. It costs a lot and takes a considerable amount of skill to setup and use, but once it's going the payoff is enormous.
We should be taking money from other things and putting them into the space program. We need these investments. See: http://www.investopedia.com/fi...