I'm one of those who don't want used things, no matter how well-maintained and in good condition they are. I like to buy new devices that have a guarantee and service provided in case there is a need for the same.
My experience taught me warranty isn't everything. Laptop with broken case because of hinges that are too tight: blame the user. New phone that stops working: blame water damage. Don't get me wrong, I buy new stuff too, but the price quality ratio is much better for older ones. If it breaks (which doesn't happen often), I'll get another one. Dispensable laptops 
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I also have only 8 GB of RAM
But why? RAM is cheap! If only my laptop could handle more, I'd add more 