Another dirty little secret re depreciation: while it is nice to get tax benefits up front, the cost base is adjusted on the sale of the asset, which means that you pay more capital gains tax. This why cashflow analysis is important.
I've heard conflicting stories on this and the article below discusses it further.
http://www.rs.realestate.com.au/review/jun06/article4.html
However even this is not clear, eg
"In addition to the above, owners of rental properties purchased after May 13, 1997 have to contend with reducing their cost base by any building depreciation claimable. That is right – claimable, not necessarily claimed. Nine years after the introduction of this rule the ATO is finally taking steps to make it more fair and manageable."
refutes your point - ie even if you don't claim it you must still pay more CGT (due to a lower cost base)
But the case below:
"In PSLA 2006/1 the ATO is of the opinion that if you have not been prepared to incur the expense of a quantity surveyor’s report in order to qualify for the deduction during the period of ownership, you should not be forced into incurring the cost just to calculate your capital gain. Accordingly, if there is no method of ascertaining the original building costs other than a quantity surveyor’s report, you’re not required to reduce the cost base by any claimable building depreciation as long as you have not claimed any during the period of ownership."
supports your point about the cost base not having to be adjusted if you don't claim depreciation