My point is that your evidence is your classmates at a particular law school. My evidence is the statements from adcoms at several top schools; that this is also believed to be the case on message boards is just an added bonus.
It may be true that there are many pre-professional majors at your law school, but I don't think that's evidence sufficient to say that liberal arts majors are not preferred by pre-professional majors at most top law schools, especially given the evidence to the contrary.
Anyways, this is a rather moot point. If the OP really wants to major in Finance, he should not let law school preferences get in the way. But if the OP thinks Finance will give him an advantage over someone with a liberal arts degree, I would urge him to reconsider.