One of the leaders at CERN said that the whole thing is only about answers, and that anything that do they find can't be used
1) to benefit mankind in any way
2) be used in practical science for dozens, maybe hundreds, of years (until they can design machines for even more money to work with what they might find)
I'm sure I'm in ignorance to many thousands of benefits of the LHC that undoubtedly justify the billions spent on it, so feel free to enlighten me.