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I disagree actually. I think that the one time investment of a nice quality pair of headphones is certainly worth it. Spud and audio is one of the most major parts of a media experience to me.
Allow me to share a parabol to illustrate my point. My mom had spent about $700 on a high end windows laptop (windows vista). A far cry from both the price and build quality of a MacBook pro. However, like all windows machines in my experience, it slowed down after a year and almost completely crapped out after two. Enter the Mac. The Mac, while priced initially is a more expensive investment, they are notorious for exceptional build quality, durability, and standing the test of time. They are very long term machines. They end up being less expensive to a certain degree because of longevity. Not to mention the customer experience is significantly better, though some may argue against that. Hence, my mom bought an iMac (then an iPad, then an iPhone, then every product apple makes).
Translation: while you may not feel it is necessary right now to spend $100 bucks on headphones, once you do (for a high quality pair), the overall experience will be significantly better, generally have longer longevity (buy 3 pairs of $30 over two years or one $100 pair???). Once you do buy the $100 pair, you will almost certainly never want to go back. The problem is getting addicted to quality headphones from there.......just don't do that.......or do and thank your ears, but curse your wallet.......