There are more trikes registered in Australia than any other type of aircraft and those that pilot them are able to gain exactly the same sorts of formation flying privileges as any GA pilot.
The two who died in 2009 did so at Cootamundra, not Yarrawonga.
My friend who died during a ferry trip was heading to Yarrawonga when he suffered a major medical crisis. This is a very rare event but GA pilots are not immune from such things, either.
So that makes 3 people, not at Yarrawonga, which statistic doesn't meet either the geographical requirements or the numerical status given to "many".
Oh...I fly GA myself but I think it's particularly bad form to slag other fliers on a public forum routinely visited by those who would close airports and cause problems for their own ends. God knows we have enough enemies of our passion without denigrating one another.
Kaz