"How many ASIC prosecutions have you ever heard of?"
Not many... in fact, I hadn't heard of any, however a quick search reveals at least some successful prosecutions. Remember that successful prosecutions require a pretty high burden of proof.
https://sitesearch.asic.gov.au/s/search.html?query=manipulation&collection=asic&profile=asic&f.By+document+type%7Ce=media+release&f.By+matter%7Cq=enforcement