Those mysterious warm and hot jupiters may have been coerced into very close orbits by big planets orbiting in a different plane.
When exo-planet hunting began in earnest decades ago with equipment that actually had the ability of finding one, there was much talk about finding rocky planets like the earth. We, of course, did not yet have the ability of finding earth twins as we do now. Earth-sized planets were simply too small to tug their parent stars in any discernible way. They were likewise too small to block enough of the light of their star in any way we could detect. Giant gas planets however had none of these problems and that is why they were the first exoplanets found.