well, if the questions is why do some people not want to be INFPs, then i think that might in part be from (a) not understanding what it feels like to have an INFP's sense of prorities, and (b) hearing some INFPs speak negatively about being INFP.
though if we're talking why don't others like INFPs, honestly, it sometimes could be that some INFPs make being INFP into a Really Big Deal, which is kind of annoying. the only time i've ever really felt any animosity towards INFPs was in that one thread... like "INFP vs the world" or something. i felt like a few people were trying to argue that INFPs are more profound than all the other types. which, don't get me wrong, i know you guys are special, but so is everyone else too.
also the very strong moral sense can be a little hard to deal with sometimes. dealing with an angry stubborn INFP is like having a cute disapproving bunny one minute and a disgruntled rhino the next.
princess diana is a successful INFP, i think. her success in terms of fame and status was largely a stroke of luck, but her success as a human being was very much because of her INFPness.