You gave me a snarky answer "newbie dude" but you never answered my question.  
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I answered your question, if you didn't get it, I reiterate:
Why I don't sell them on raise or other sites: Again, What makes you think that I don't?! I've sold them on raise and other sites and had the money transferred to my paypal, now I want to buy bitcoins with it, how much would I loose? I did a simple calculation, that I'm sure you're capable of it too, and saw selling these directley for bitcoin makes sense and i don't loose that much. Plus, only for a couple of these cards I receive 80%, and they are hard to get, but most of them go for 60-70% and some even less.
For buyers: that's why I have not been able to provide some of the gift cards you've asked me for.
Why they're guaranteed for 48 hours? because If I guarantee them for 6 months (like reputable gift card sellers), and someone abuses them, and post a bad review after 3 months, no one will buy from me, but for 48 hours, I guarantee every card, I'll check then I'll replace them. It's not like only sellers here can scam buyers, the scam works both ways and I honestly prefer loosing buyers than being scammed. hope the answer was to you're satisfaction Mr Hero.