Thats because feral rage isnt that great of a skill to invest into. Its awesome as a 1 pt skill but thats all you generally need because +skills get it high enough to be useful. The only benefit to maxing it is for the damage bonus. While it is much less than fury it targets only one enemy at a time and this is good for killing monsters that spawn adds such as the ubers bosses.
After 20 in Wolf/lycan/oak or How/ and fury the remaining pts can be spent on whatever you want. A lot of people do summons, some do feral rage and others max both sages. Seems that you will do feral rage.