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THIS.
I know a lot of people that earn ridiculous amounts of money and are in debt or say they can't afford certain things, and some 'poor people' (myself included) that save a small amount that adds up to a lot over time, it's all down to mental attitude and will power, I think with a lot of people they just don't have the patience to save, or even see the value in it.
I earn under 12k a year, live in a flat, have all the regular bills, I have most gadgets I want, and I have a good few grand in savings, I am pretty happy on a low income, it can be challenging at times but at the same time it can be very rewarding when you finally get what you want and you have a greater appreciation for it.
I haggle a lot, I also keep a close eye on the second hand market, when it comes to Hi-Fi you can grab some silly bargains, also know when to sell or trade in items at the right time, for example, I just traded in my PS4 to Game, they only wanted to give me £89 for it!, in the end I managed to get £151 in store credit and a few quid on my reward card by getting them to price match CEX voucher trade-in price, that is a good down payment on the PS4 Pro when it comes out in November!