Personally I think introducing a standardised competition for poi would lead to the downfall of Poi as we know it.
when you start putting one poi'er with their style above another - (on the basis of taste) ppl will try to emulate that style, and we will lose a large portion of the stylistic diversity we enjoy today.
super - If you think you are good. thats good. If you think you are great thats great, if you think you are the best *you can be* thats tops. You dont need someone else to tell you. You will know when you reach the extremity of your ability.
I personally think that the poi represent an inner jounrey of infinite length. If you follow the path, you will visit many interesting places...and meet interesting ppl 
Perhaps a poi master's summit would be good?
A place and time when deep poi'ers from around the world can meet and learn from each other - in a non-competitive (at least formally
) environment.
We could hold it on the summit of mt. Hotham during the summer for a week - a thoroughly beautiful place, cheap Aussie accomodation too 
Although - I guess it depends on how internal your path is...some ppl probably wouldnt be interested in anyone else's research - they are solely following the lone path of self-enlightenment...
Josh