Taunt - cap on hate per click?

[one_chill_cat]

My understanding of Taunt according to wiki & posts: Click for a chance to be put at the top of the hate list +1. The higher your skill, the better chance it has to work.

My question: Has anyone else noticed that it works noticeably less when someone has built a fair amount of aggro/hate first?
It seems I get nearly 100% success early in a fight. If I am coming to a fight late, and someone else has already built up a fair amount of hate it seems nearly impossible to rip aggro w/ taunt. I can click it over and over w/ no result, or ripping aggro just as the fight ends.

I cant help but wonder if it has limitations on how much hate can be generated per click, or if it functions differently than we all understand. Has anyone else noticed this?