Some interesting data here from yesterday's auction, especially for the .net.au fans (I'm not one of them),
Tunes.com.au sold for $1,755
Tunes.net.au sold for $26
The .net.au price is 1.4% of the .com.au price.
Lottery.net at $220,000
Italy.net at $52,000
Poker-Gratis.net at $6,299
Corn.net at $4,200
CXC.net $4,000
E-Energy.net $3,800
End.net €3,000 = $3,780
http://www.dnjournal.com/domainsales.htm
The .net market is reasonable, personally I have got some good prices for .net names in that past (though I'm not a big fan of them and have sold almost all of mine off over the last few years).
But when it comes to .net.au that is completely different, the values are terrible and the public perception is poor, we've seen the top of the tree (in terms of quality) with jobs.net.au getting 5k today, where does it leave everything else? Well we can see, "good" keywords better than 99.5% of stuff out there like tunes.net.au are worth reg fee.
I dont see any reason not to take the .net.au if one owns the .com.au and visa versa if you can't get the .com.au get the .net.au for reg fee in some cases although there are fewer and fewer .net.au available when the .com.au is taken ...
I still don't understand the general aversion to .net.au domains, like people suggesting there is a credibility issue. In my experience there are far greater factors determining Google serp positions, for example domain age and backlinks, than whether the domain is .net.au or .com.au. Some of my .net.au domains perform just as well if not better than my .com.au domains in certain areas for the same terms.
So with the potential of quite a few exact search term .net.au domains still available and their potential SEO benefits alongside their sometimes much more expensive .com.au equivalent I see .net.au as currently quite under-valued.
If I were selling blue widgets I would much rather have bluewidgets.net.au than someabstractname.com.au if bluewidgets.com.au was already taken.
With the amount of very usable .com.au domains available that isn't likely to be the choice people will have. If the want a keyword domain it will just mean weaker keywords, but not something totally left of field.
About 7 weeks ago I acquired carloancalculator.com.au (undeveloped and not indexed), when I started the .net.au version was #2 and #3.
In 7 weeks I became #1.
I have seen this time and time again. For example I have a domain which has a holding site (amazon affiliate site) on it called greengrocer.net.au. Literally within a couple of weeks it was consistently within top 3 results on google, often number 1 for "Greengrocer" and "Online Greengrocer", now 18 months later it is nowhere to be found (which is hardly surprising as it has never been updated). The site is just an Amazon affiliate site so Google probably knows that and has pushed it way down the list now, but I have seen the initial high rankings with all sorts of domains not just Aussie ones. I reckon Google is testing new domains when first indexed to see click through response.