Hehe, that rugby team thing is debatable- We certainly have the team that won the last RWC. 'Best' is a very relative term...
You'll start to see some of the many many reasons we're not quite up there (considering world standards) when you compare us to somewhere like North America/Europe... (add to this list please?)
- US/Europe has the sponsors able to support full time professional climbers. I'm sure that if we had a hundred or so people doing nothing but travelling and climbing full time we'll be pushing 8c flashes too
- US/Europe has the numbers of climbing people (think quickdraw wielding masses) to support the products these sponsors sell, enabling the Evolvs/Petzls/Bluewaters/DMMs to pay people to climb. Compare the prize sizes between int and local comps.
- Other points relating to $$... Number of climbing films produced/purchased, number of people putting up routes, number of developed crags with easy access, media coverage of (and you can laugh here) 'extreme sports'
Fact of the matter is, the more people in a population, the more people you'll have climbing, the more money available in the climbing pool, the more people doing it for a living, the more time spent climbing, the higher the grades.
It's all about the money.