Kickers aren't ranked higher simply because those at Rivals do not know enough to do so. They can mask it as being a case of kickers not having enough of an impact, or not knowing how they are going to react in front of 80,000 people, but that is comical at best. You can say the same thing about a lot of other position players who are given full rankings - not knowing how they are going to react in front of huge crowds (qb's) or not having a huge impact in the course of a game (fullbacks, tight ends).
It comes down to ignorance about the position and not putting the effort in to know who the best are. Kind of sad.
Classic example is the latest Rivals ranking in which they have Palardy (15 offers) ranked as the 2nd best guy in the nation behind a guy who has 1 offer. Palardy was even offered first ahead of that guy. And those of us in Florida who have seen both understand it is not even an issue.
The rivals guy feeds us some bs about limited fg opportunities but then you watch both kickers highlight reels and the supposed #1 guy is barely hitting the endzone on his KO's while the other guy is blasting them 10 deep every time. Why does that Rivals guy not comment on that - or the 15 offers compared to 1 offer - like to hear what criteria influenced his decision making and mindset.
In the case of kickers, Rivals listens to one voice with a vested interest and allows him to dictate rankings. Scout actually does a better job of ranking recruits - more thorough, more comprehensive, more accurate, and solicits more than one professional opinion before putting out their rankings.