Well, if you have a gift card that you have no idea what to do with, then porn is clearly the answer. Hell, you could get an Olive Garden gift card when you're on a gluten free diet or a Barnes & Noble gift card when you have clearly been using a Kindle for the past 3 years.
In most of these cases, you get a gift card that is totally useless to you, because there wasn't any real thought put behind the gift card. I don't know about you, but when someone gives me a gift card it's because they don't know me well enough to buy me something meaningful or they just don't care enough. You can still cam2cam in a private show, but you can get your rocks off without spending a dime if you prefer. Many users prefer to tip the guys to perform in the open show rooms.
Unlike Flirt4Free and LiveJasmin, Cam4 isn't necessarily a private show orientated site. The site is filled with many male exhibitonists and amateurs who masturbate naked on camera for everyone in the chat room to watch. Cam4 has a great selection of men from all across the world.