tl;dr: Troy went into the rabbit hole of buying a bunch of high-cost gadgets and accessories [that he legitimately needed] to get tax deductions.
Many people don't have the luxury of strategising any of their interactions with the tax system. Either because their situation isn't covered by any deductions, or because they don't posses the knowledge, or because they don't possess sufficient free time to investigate.
https://www.ato.gov.au/Individuals/Income-and-deductions/Ded...