user31731: This $10k ASIC miner has 1TH/s and by this hashing calculator (I know they're not THAT precise but...) it'll generate like $63.23 per month? Why would anyone invest in this?

user31581: They wouldn’t. You just have to do the maths, which you have done. The tricky part is trying to figure out how fast you can recoup your investment before you make profit. Generally, it’s not a linear relationship. 

user5757: That particular miner is way overpriced.  Nobody should buy it at that price.  The seller either listed an incorrect price, or is very confused about the current market for mining hardware, or is hoping to find a customer who is a sucker.
For comparison, the Antminer S5+ has a (claimed) hash rate about 7x higher and costs about 1/4 as much, making it about 28 times more economical.  

31731: <p>This <a href="http://pt.aliexpress.com/item/Free-Fedex-btc-miner-180GH-s-bitcoin-miner-AntMiner-S1-asic-miner-for-bitcoin-mining/1722841938.html?ws_ab_test=searchweb201556_3,searchweb201644_2_10001_10002_10005_10006_10003_10004_62,searchweb201560_8,searchweb1451318400_6150" rel="nofollow">$10k ASIC miner</a> has 1TH/s and by <a href="https://alloscomp.com/bitcoin/calculator" rel="nofollow">this hashing calculator</a> (I know they're not THAT precise but...) it'll generate like $63.23 per month? Why would anyone invest in this?</p>
 31581: <p>They wouldn’t. You just have to do the maths, which you have done. The tricky part is trying to figure out how fast you can recoup your investment before you make profit. Generally, it’s not a linear relationship. </p>
 5757: <p>That particular miner is way overpriced.  Nobody should buy it at that price.  The seller either listed an incorrect price, or is very confused about the current market for mining hardware, or is hoping to find a customer who is a sucker.</p>

<p>For comparison, the <a href="https://www.bitmaintech.com/productDetail.htm?pid=0002015081407532655504JMKzsM067B">Antminer S5+</a> has a (claimed) hash rate about 7x higher and costs about 1/4 as much, making it about 28 times more economical.  </p>
