Sorry, your sums are off. I do understand and I reject your premises. The last dividend paid by scryptsmining.com for the 9 days ending on 4/26 worked out to .0000071 btc/khs/day, 6% more than the current .00000654 btc/khs/day scrypts.cc is paying. One kh/s at scryptsmining.com costs .0008 btc compared to .00096480 btc at scrypts.cc, so cost per kH/sec is 16% less at scryptsmining.com while dividends are 6% more than scrypts.cc this week.
If scrypt.cc is using part of their GPU farm to mine scrypt-N coins I have seen no confirmation from ScryptCC. You seem to infer that when scrypt ASICs start shipping in quantity this summer any scrypt multipool mining will become less profitable and scrypt.cc will prosper because they will switch to strictly mining scrypt-N coins, which is disingenuous at best. My bets are still on scrypt mining using a solid multipool buying hardware with the lowest cost per kH/sec.
For the record ... scrypt.cc has been mining scrypt-N. I'm sure other's can backup this claim.
Now let's check the math.
http://scryptsmining.com/index.php/dividends04.17.2014
0.94109154 BTC 0.00071403 BTC
04.26.2014
6.33101774 BTC 0.00415967 BTC
Calling it 9 days. (probably more ...) and they claim to have ~900 mhs, building to 1 ghs.
From the page ... That is where my 900 mhs came from.
"Scryptsio Next dividends will be paid tomorrow. All hardware were volt modded, our cumulative hashpower is 890-915 Mh/s. 1 Gigahash target is near!"
6.33101774 BTC / 9 / days = 0.70344651 BTC / day. This is for 900 mhs.
.70344651 BTC / day / 900000 KHS = .00000078 BTC / KHS / day
For srcypt.cc, we are paid out every ten minutes ... there is a lot of variance but I use 4.2 satoshi / KHS for a payout. Most will agree that is on the low side of the payouts.
.000000042 BTC / KHS / payout * 144 payout / day = .00000604 BTC / KHS / day
So there you have .00000604 / .00000078 = 7.7
Scrypt.cc is paying out 7.7x what ScryptsMining.com is paying.
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Prehaps they only have ~150 mhs sold of the 920 mhs they claiming.
So most recent dividend per share ....
04.26.2014
6.33101774 BTC 0.00415967 BTC
04.29.2014
1.23418776 BTC 0.00069807 BTC
Call it 3 days.
.00069807 BTC / share / 65 KHS / share / 3 days = .00000357 BTC / KHS / day <== Much higher so most of the share weren't sold?
4.2 satoshi / KHS / payout is probably only a little low for the last 3 days. ==> .00000604 BTC / KHS / day
So now we are only looking at about 1.7x difference in scrypt.cc's favor.
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Going with your share computations:
During the high period .00000711 BTC / KHS / day, will just forget about the claims on the landing page. This assume that most shares have not sold.
That time period covered a very high payout period where most payouts were double normal, but let's just go with 50%. 6.3 satoshi / payout.
(Look at my records this looks like a pretty reasonable number for that time period.
.000000063 btc / KHS / payout * 144 payout / day = .00000907 btc / KHS / day.
EDIT: This turns out to be high ... suchmoon data shows that .00000750 btc / KHS / day, or basically the same during this period. However this is a hand waving comparison since I didn't keep that detailed of records. In any case we still get scrypt.cc beating scryptsmining.com by a lot. So I back down from my 7.7x claim and will go with your shares where scrypt.cc is only beating ScryptsMining.com by 1.7x.
This can be further backed up by
https://bitcointalk.org/index.php?topic=514242.0 That show the scrypt.cc is easily beating the scrypt multipools, but it isn't doing as well as leasing hardware.