I own some of these assets and having done the math am not that convinced they are a good buy. At 0.004btc for 1 mhash/second you would need to purchase 333 shares for 1.332btc to get 333mhash per second, however that would also buy you 2 x Block Erupter (USB ASICMINER) which would give you 666 mega hash per second.
Given mining will not start until September I do think see these ever being profitable to hold.
Have I calculated something incorrectly or could I start a bond/asset like this with block Erupter and essentially double my money?
Thanks for your question, I fully understand your concern and it's one I hear often.
You're right that buying hardware may yield a higher return on the hardware cost. If this wasn't the case, there would be no way to run shares mining operations at all; if I paid more for the hardware than I get in return, I would be giving money away. It does, of course, depend on which hardware you get, and the AM USB miners are even one of the worst in terms of performance available. You'll be better off getting the AM blades or get one of the larger mining machines from KnC or Bitfury, for example. There are even group buys that will give you a piece of one if you don't have the funds or are willing to risk a whole machine yourself.
In terms of buying and operating your own hardware, there are several factors that make this a very different proposition than getting a mining contract. You need to account for the risk (theft, hardware failure, other catastrophic events) than can cost you your entire investment in one fell swoop. You can get insurance to some extent, but at the very best it adds cost, and at worst, you won't be able to replace your hardware in the short term, costing you additional revenue and vital time.
Then there is the operational overhead. If you have USB miners, for example, you need a host machine that is online 24/7, which normally isn't that big of a deal, but still worth considering. However, you also need to be available 24/7; if your miner goes down just after you go to bed, it might be 8 hours lost. If your miner goes down just after you leave for a three-week vacation, well, you need to have some way of getting it back up or you're losing money.
You also need to account for the added electricity. For a couple of USB miners, this won't be much, but for a slightly larger installation, the cost can be significant, depending on your power cost. If you live in a warm country, you also need to expel the heat, which adds further electricity cost. You'll probably be better off going with a share in a group buy; just make sure you have a backup plan for when your hardware fails or that you account for that possibility in your profitability estimates.
If you plan on setting up your own asset, however, you're of course free to do so. There is significant time involved in doing so, I can tell you. The estimates from the BTCT asset issuer FAQ is 10-15 hours per week, and I'm not sure that is enough, at least initially. Also, you need to assume the responsibility for the hardware, the availabililty, the operation, internet connectivity, and so on.
If you're willing to do that for what would essentially be double the output of just mining with your two USB miners, then sure, you should definitely put up an asset and bring the prices down. Keep in mind, though, that you are committing to years of work and responsibility to contract holders. For a two-miner operation based on a price of $200, even if you have a 500% markup, you're looking at earning $800 for three years of working 10-15 hours per week.
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