Let's get to the point.
You want the highest daily payout per dollar invested.
Real numbers as of today (September 11th 2014):
ZenHashlet w/5% autobuy discount - $19.90 or 0.04190 BTC per MH/s SCRYPT
minimum $19.90 + (must purchase 1 item at regular price to open account)
never expires. Accepts BTC only for autobuy. Credit cards and BTC accepted for initial purchase.
daily payout estimate - 0.00067009 minus daily fee of 0.00016600 = $0.2407 or 0.00050409 BTC
1.2030787589498806% earned per day. - Calculation: daily payout divided by purchase price multiplied by 100.
ROI - estimated 83.12 days to break even without difficulty increases.
Note: difficulty increase currently averages 1.119% per day for SCRYPT and 1.201% for SHA-256.
Note: Multipool may mitigate some of the difficulty increase - not enough historical data to calculate at this time.
If you are not beating these daily percentages you are unlikely to ROI.
ZenHashlet - $20.95 or 0.04374 BTC per MH/s SCRYPT
minimum $20.95
never expires. Accepts credit cards and BTC.
daily payout estimate - 0.00067009 minus daily fee of 0.00016600 = $0.2407 or 0.00050409 BTC
1.1524691358024692% earned per day. - Calculation: daily payout divided by purchase price multiplied by 100.
ROI - estimated 86.77 days to break even without difficulty increases.
Note: difficulty increase currently averages 1.119% per day for SCRYPT and 1.201% for SHA-256.
Note: Multipool may mitigate some of the difficulty increase - not enough historical data to calculate at this time.
If you are not beating these daily percentages you are unlikely to ROI.
BitcoinCloudServices - $1.189 or .0025 BTC per GH/s SHA-256
minimum purchase 50 GH/s @ $59.44 or 0.125 BTC
5 year contract. Accepts BTC only.
daily payout estimate per GH/s - 0.00001834 no fees = $0.008730
0.7336% earned per day. - Calculation: daily payout divided by purchase price multiplied by 100.
ROI - estimated 147.21 days to break even without difficulty increases.
Note: difficulty increase currently averages 1.119% per day for SCRYPT and 1.201% for SHA-256.
If you are not beating these daily percentages you are unlikely to ROI.
HashletGenesis w/5% autobuy discount - $0.95 or 0.001985 BTC per GH/s SHA-256
minimum $9.49 + (must purchase 1 item at regular price to open account)
never expires. Accepts BTC only for autobuy. Credit cards and BTC accepted for initial purchase.
daily payout estimate per GH/s - 0.00001846 minus daily fee of 0.000004101 = $0.006858 or 0.000014359 BTC.
0.723375314861461% earned per day. - Calculation: daily payout divided by purchase price multiplied by 100.
ROI - estimated 145.76 days to break even without difficulty increases.
Note: difficulty increase currently averages 1.119% per day for SCRYPT and 1.201% for SHA-256.
Note: Multipool may mitigate some of the difficulty increase - not enough historical data to calculate at this time.
If you are not beating these daily percentages you are unlikely to ROI.
HashletGenesis - $1.00 or 0.002093 BTC per GH/s SHA-256
minimum $9.99
never expires. Accepts credit cards and BTC.
daily payout estimate per GH/s - 0.00001846 minus daily fee of 0.000004101 = $0.006858 or 0.000014359 BTC.
0.6860487338748209% earned per day. - Calculation: daily payout divided by purchase price multiplied by 100.
ROI - estimated 145.76 days to break even without difficulty increases.
Note: difficulty increase currently averages 1.119% per day for SCRYPT and 1.201% for SHA-256.
Note: Multipool may mitigate some of the difficulty increase - not enough historical data to calculate at this time.
If you are not beating these daily percentages you are unlikely to ROI.
PBMining - $1.284 or .0027 BTC per GH/s SHA-256
minimum purchase 25 GH/s @ $32.33 or 0.0675 BTC
5 year contract. Accepts BTC only.
daily payout estimate per GH/s - 0.00001834 no fees = $0.008622 (only pays weekly)
0.6792592592592592% earned per day. - Calculation: daily payout divided by purchase price multiplied by 100.
ROI - estimated 158.12 days to break even without difficulty increases.
Note: difficulty increase currently averages 1.119% per day for SCRYPT and 1.201% for SHA-256.
If you are not beating these daily percentages you are unlikely to ROI.
CEX - $1.80 or 0.003653 BTC per GH/s SHA-256
minimum purchase as little as $0.004937 or .00001000 BTC
never expires. Accepts BTC/Altcoin.
daily payout estimate per GH/s - 0.00001834 minus daily fees of 0.00000611 = $0.005750 or 0.00001223 BTC (pays hourly)
Note: CEX also pays a small amount of NMC and IXC which can also be converted to GH/s or BTC and you can sell your GH/s at any time.
Note: CEX now acts as a free Altcoin wallet and lets you trade any major Altcoin - LTC, DOGE, DRK, NMC, IXC, POT, ANC, MEC, WDC, FTC.
0.3347933205584451% earned per day. - Calculation: daily payout divided by purchase price multiplied by 100.
ROI - estimated 298.69 days to break even without difficulty increases.
Note: difficulty increase currently averages 1.119% per day for SCRYPT and 1.201% for SHA-256.
If you are not beating these daily percentages you are unlikely to ROI.
Notes on difficulty increases HERE!
Official threads ;
https://hashtalk.org/topic/4973/side-by-side-roi-comparison-of-cloud-miners-hashlet-comes-out-on-top-updated-with-5-autobuy-discount-new-genesis-data-and-difficulty-notes