I think if you have an interest in a particular niche or subject, you will have a much easier time relating to your members and, therefore, make better sites. But that does not mean that you cannot take the time to learn about the type of people who would go to a site you want to build. It just takes more effort and an open mind. If you are straight and homophobic, then you may have a real problem building a gay site. Along the same vein, if you are gay and misogynistic, building a straight site might be hard as well. But I see no reason why an open minded person can't take the time to learn enough to build a site that is out of your interest/experience range and succeed at it.
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