Sorry to sound like a curmudgeon but this is chump change unless you went VERY big. If you got 10, 20, 30, even 100, I don't see the point.
Let's see: get 100 dollars in staples GCs for 60, sell to giftcard.com for 86. That's 26 dollar profit per 100 dollars. So... even if I bought a HUNDRED of these cards (which means I laid out 3 thousand bucks!) I make 780 dollars. If you went BIG and got 999 cards, then making 7k is nice even if dealing with the tircha becomes a full time job for a week.
Oh...and I wonder if the street value of staples GCs won't PLUNGE now for a while.