Hi Zulufields,
Your questions haven't been asked but that's probably because the answer is quite difficult.. I'll try to answer all of them:
- Expected costs of hosting per share
We are looking at different options in Holland and Norway. We don't know what the costs of hosting at KNC yet. It looks like hosting a single miner will cost around € 400,- euro a month (this is a really rough estimate). Mainly because racks usually have 32Amps and one miner uses almost 5 Amps. It mainly depends on final power usage numbers; heat and size since those numbers aren't 100% sure yet.
- hardware failure prediction estimate
No we don't. Although we believe that it will be possible to replace parts of the device if broken. This is one of the reasons why we want to have as much miners as possible to spread risk. It's probably possible to tune the machines; we will do that only if we know for sure it doesn't shorten lifespan.
- returns per share over next 24 months
This is the most difficult question. At current difficulty one Jupiter will mine 11.2793 BTC a day (Look here for calculations
http://www.bitcoinx.com/profit/). That means break even within a week. However there's no way to tell what the difficulty is going to be when we get the miners. Last few times difficulty went up between 10 and 20% per ~two weeks (
http://bitcoin.sipa.be/). With 15% per two weeks difficulty will be around 300% of what it is now so payout will be 3.7768 BTC a day which means a break-even of 18 days. Look at the numbers mentioned above and play a bit with the numbers.. Realise yourself though that these miners themselves will have a huge impact on the difficulty.
Hope this helps,
Cheers,
We're both located in Europe so for the next 8 hours or so we're sleeping 
