Hi - I have no idea the history of this pilot (although as we can read in the Harrogate Gazelle accident you only need one shunt, one mistake) - but aerobatics or display flying is not just a case of having a go and seeing how it works out.
I'm not sure if or where the accident report is but it would make an interesting read.
Some years ago a Hawk training jet solo demo crashed after performing a poorly executed barrel roll. The pilot was a well respected BAe test pilot who sadly died.
The point I guess is that even the most highly trained and experienced guys make errors. If you look at the 2012 helicopter accident reports actually there are more CPL holders than PPL listed - in fact at least 2 of the PPL holders listed have several 1000 hours experience.. Not just wealthy low time joyriders.