Im willing to give the "drilling out" technique a go, i mean a large quantity of oil all over the cam is better than a drop or 2 in the right place surely? But i can see SAS's point also, if there is no oil getting the the platform in the 1st place then maybe the problem lies elsewhere!
270,000KMs on a cam speaks for itself surely? There can't be many people in the UK with that sort of mileage on a CVH cam, i got nearly 130,000Miles on my last cam (standard ford), but whos to say it was the original cam when i brought it?

Back to topic... Surely the power output of the engine doesnt effect the rocker arms, it must be a rev related issue that causes them to fracture or snap completely!