Nobody knows, and one persons experience has no bearing on what yours will be. Might get 2, might get 3....You won't know until you are denied the next one.
Bank Statements have always been required and not cash. Next time be as prepared as you can, research and have as many documents and proofs that you can have to cover all bases.
I suppose I can see that if aiming for the absolute maximum of 270 days then you would 'lose' days. I wonder how many people actually do this and therefore are cut short by 2 weeks. I also doubt that a tourist visa would take 2 weeks to come back from Perth consulate. Think mine took 5 days or something last time I did it.
It would only affect a multiple entry visa. And in that case you would re enter before the original visa expiry date and be stamped in for a period past that date anyway. I don't see how you lose 2 weeks??
Tourist visas have to be activated by entering Thailand within 3 months of the issue date. So you might just scrape in with the 2 weeks...LOL...you then get the period of stay that starts from the entry date.