All stat tiers (1-10) give you a bonus in the corresponding stat but for some stats the bonus you get the higher you go becomes less, not by a lot though. There is one stat that is essentially useless after 6 and that stat is Resilience. Pretty much anything after 6 Resilience, unless your a Titan, is useless and you end up wasting points. Aztecross Gaming has a video on his Youtube channel that shows off all cooldown rates at all tiers.