I have a (formerly) Wingspan.com Visa which I had gotten awhile back when Gomez was offering $75 for signing up. It gives me 5% off Amazon purchases, and this is all I solely use it for. (I have 3 other credit cards). Being that I use this only for amazon, and order maybe $10 worth of items from them a month, should I just go ahead and close this card. Or, does it not really have an effect on my credit score since I don't charge much, and I always pay it on time? I figure it'll eventually come in handy when I finally decide to get a subwoofer or something from amazon. 
