I see both sides of this, and can agree with both sides, if you dont like a subject, then dont build it, but at the same, there is nothing wrong with building outside your comfort zone once and while.
For me, at this moment, I am only going to invest the time and money on stuff that I have an interest in, but I do want to build some subject's that I normally do not build, just open my building world up a little bit, that is one reason why I joined a model club.