how i afford to spearfish every day, living on a tropical island (& why I can't afford not to) 

If you’re interested in learning more about freediving, I recommend taking a freediving course. But in the meantime, you can read this book about humans’ natural ability to dive deep, how freediving was used in the past and how it is used today:
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If you want to learn more about spearfishing, I recommend learning about freediving first. After that, you should read this book by Terry Maas, an OG spearfisherman. It will inspire you to explore to world and search for big fish:
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This next book is about how being in and around water is scientifically proven to improve your mental and physical health, creativity, and even improve your hearing and eyesight:
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Another great freediving book is Oxygen, by William Trubridge. Trubridge is the deepest “no fins” diver in the world, able to travel to 334 feet (102 meters) and back on one breath (without fins). Oxygen tells about his journey from a beginner freediver, blacking out on a 30-something meter dive (relatively shallow for a freediver) to becoming the deepest in the world:
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The last book I’d recommend is One Breath. It tells the tragic story of an American freediving champion who pushed past his comfort zone one too many times. It is a great resource for learning about the dangers of diving unsafely, but this book actually made me feel a lot safer about freediving - because the things that went wrong in this unfortunate story are very easily avoidable:
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I use this awesome giant plastic case to protect my spearfishing/freediving gear while traveling (it's also good for skis and that sort of thing) :
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Gopros are only rated to take to -30 feet (-10 meters) so you need to put it in a plastic case to protect it when going deeper. A plastic case also stops the water from messing with the touch screen. This is the one I use and I’m very happy with it:
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These are the carbon fiber fins I use:
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This is my freediving watch (great value, IMO):
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I use this rashguard when I’m in warm water and don’t need extra warmth but still want a chest loading pad for my gun:
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I live in Amed, Bali, Indonesia, and freedive and spearfish every day. This is how I got here.