I think you're dramatically overestimating the degree to which fans of Twilight are psychologically abnormal.

I wouldn't be surprised if this is true.

This still does not answer the question "What sample can we use that filters out fanaticism from mentally unbalanced people to compare the type of excitement that gifted people feel to the type of excitement that everyone else feels?" Not to assume that no gifted people are mentally unbalanced... I suppose we'd really have to filter those out of both groups.