The reason why the Pal System fails.
2. Boss essences is the only 2nd benefit. However in order to benefit from this you must literaly steal 1-2 essences from your pals. No Pal would appreciate this nor would want to become your Pal for the gift of 1 monster.
So really only mutual benefit for the inviter, the PAL, and for haypi occurs at 1. And is a one time thing.