One Make Rally Competitions?

What do you all think about one make rally competitions. Should these competitions be left open to the inexperienced or new rally driver? Or do you think that these kind of drivers would achieve greater benefit from mixed championships?

In Australia we have a Proton Satria one make competition as a class in the Rally Championship, which means the drivers get a taste of the real thing while learning and competing on equal terms with others as well.

It's a good idea, but so far I haven't really seen anyone come through into the main championship (previously they used Toyota Corollas). Though with the Proton series, first prize is a drive in a Proton in the Rally of Great Britain, so something may come of it this year.

I know of one such type of rally in Ireland. The Ford KA Rally Championships. This is only the second year of running but the winner from last year has already moved up into one of the bigger championships. As for the others left in the championships, I believe that it is a great breeding ground for them to test their talent and to get the foot in the door of bigger championships so to speak.