The buy and sell on ebay is valid and ethical.
Well, I don't want to go too far off-topic and start arguing with you about all the opportunistic thugs operating some of the larger on-line markets and payment services, but if you are selling equipment to people for more money than you know it can mine then you are taking advantage of them. I'm sure there are exceptions amongst people who have free electricity. With respect to use of S1 and S3 machines as heaters, its an interesting idea but the case for their deployment really depends on an explosion of BTC/fiat exchange rates that may or may not occur. That is a subject which is probably topic-worthy but in a different thread.
I disagree. Ebay is a reasonable way to judge a paypal-priced value for things, and for people who have no BTC and have no way to easily get BTC paying a 10%+ premium via ebay/paypal is not terrible.
and even if the equipment stops being profitable in 5 months with a $600/BTC, if prices jump to $1000 you can suddenly get another 2 months use and quite likely make a profit. You need to look at the value of the mining equipment both in terms of current market conditions as well as how the market may be in 6 months from now, or a year form now.
If BTC went up to $2000 during July, even the 7w/GH BFL equipment would start coming back online again and making small profits
Well sure. But if the seller thought this was likely to happen it is unlikely they'd be selling their equipment on ebay.
The world is full of people who think it is ok to exploit other people for a profit. Its no different here.
