DrummoSolo
All Australian
Plenty of examples of unearthed artists who toured a lot but didn't receive commercial airplay polling well i.e Parlez Vous Francais etc.
Also true. As I said, it's not a hard and fast rule, and there's plenty of exceptions (if we class, say, top 20 as success, you could add Jezabels, Cloud Control, and many others I've surely forgotten to the list). But as a general rule, if you're taken a route to success that something's like...
Get played on triple J > get put on high rotation > get added to Nova/MMM/Fox/etc > have a single that charts in the ARIA top 20
You're usually on a path that'll get you in the top 15-20 at the VERY least (examples from the last two years alone - Angus and Julia Stone, Mumford and Sons, La Roux, Birds of Tokyo, Little Red, Ceelo Green, Lisa Mitchell, Lily Allen, Duck Sauce, Dizzee Rascal, etc etc etc).