Stop rewarding tanks/healers! We all put in the same effort.

[Sakei]

Honestly, the system doesn't just reward tanks or healers. It rewards anybody in a role that is needed. There is your answer, original poster. There are tons of dps for every healer out there, and there are still plenty of healers for every tank. That's why you almost always see group in need of tank. I've seen the group in need of a healer msg 1 time ever