So I have been watching the prices of the R9 280x for a while now, and when the price suddenly went up by $110 dollars in less than a month, I was a little curious as I still had yet to buy my second one. As of right now I have 2 R9 280Xs which I bought for gaming, but I have heard that this price spike was because the cards were extremely popular for bitcoin miners. After doing more research on the topic I discovered a lot of people don't consider GPU-based mining to be profitable because of the cost of getting a mining rig as well as power consumption. Disregarding the initial cost of building a mining rig, is it easy to make money with an existing rig? Another factor to consider is that I pay no electricity bills, so my cost for operation is basically the pool fee. I guess my question is is there any reason for me not get involved? Is bitcoin mining particularly hard on the GPU? The only other question I have is for someone who has a lot of experience and knowledge on the topic. About how much money can I expect to make with these two cards over the course of, say, a week? I'm not asking for a link to a calculator, I know they exist. If no one can answer this last question that's fine. Thanks everyone!