In answer to your question, no. Half a dozen Harvards would be a lot cheaper / noisier / closer to the crowd / in view longer / war-ier / more suitable for blowing the crowd over while taxying out, than PC-9s.
Really, there is something just too polite about PC-9's whirring their way through formation aerobatics. While the crowd would appreciate what the Roulettes are and do, what they really want is a thrill and that went out with the Macchi and the introduction of the offset display line concept.
Another point is the lack of advertising about Roulette shows. They have been in Darwin twice in the last six months and both times most people only knew after the fact when seeing ten seconds of the display on the 6pm news.
Advertising seems to be left in the hands of the associated event, rather than via a RAAF
PR organisation who
should spruik the thing for weeks before hand.
Still, if some little kiddie is going to turn into a pilot, even a static display is going to flick the switch in his/her head
