My calculations currently yielded 12.85 average satoshi per KHS for my recent 300 minute interval... I've been preparing an excel with calculations in a 30 payment interval (300 minutes). My interval started more than 10 minutes before my most recent KHS auto increment and more than 10 minutes after the second most recent KHS auto-increment, in order to factor out the re-investment (as if I had auto invest off). These were my 30 payments not affected by auto-invest for my 468 KHS:
revenue/468KHS/10mins
0.00000042075138584934
0.00000042074868699279
0.00000042074872904345
0.00000042074828634674
0.00000037867385916729
0.00000042074871562773
0.00000042075139498238
0.00000042075139749561
0.00000042075385724815
0.00000042075404792488
0.00000042075138724822
0.00000042075140016707
0.00000042075138276795
0.00000042075368151698
0.00000042075396991020
0.00000042075126527177
0.00000037867857501019
0.00000042075404620521
0.00000042075375217419
0.00000042075393954483
0.00000042075405194585
0.00000042075137748805
0.00000042074873359145
0.00000042074606277229
0.00000042074873762614
0.00000042074873468968
0.00000042074607168006
0.00000042074606993548
0.00000042074606336479
0.00000042074606361884
I split the 300 min interval and calculated the average of the first 15 payments and the average of the the next 15 payments. for my 468 KHS the first 15 payments average was 0.00000041794614548592
BTC and the average of the next 15 payments was 0.00000041794490299459
The payments per 10 mins had dropped from the first 15 average by
(0.00000041794614548592 - 0.00000041794490299459) = 0.00000000000124249133
That is a percentage revenue drop for every 150 minutes per KHS
(0.00000041794614548592 - 0.00000041794490299459) / 0.00000041794614548592)
= 0.00000297285031599815 = 0.000297285031599815 %
There are 24 * 60 / 150 = 9.6 intervals of 150 minutes in 24 hours
Therefore, using the compound interest formula the expected compound revenue decrease rate per KHS is
(1 + 0.00000297285031599815)^9.6 - 1 = 0.0000285397278616539 = 0.00285397278616539 %
and the expected monthly revenue decrease based on this 300 minute interval, would be
(1 + 0.00000297285031599815)^(9.6*30.5) - 1 = 0.000870828229561749 = 0.0870828229561749 %
and the expected annual revenue decrease rate would be:
(1 + 0.00000297285031599815)^(9.6*365) - 1 = 0.0104712963079583 = 1.047129630795830000 %
So ur wrong, it does decrease over time

(which it should) due to the expected decrease of efficiency of the ASIC miners due to the rising difficulty of mining, although quite a little.
Therefore id someone is making 10 USD, EUR,
BTC every 10 minutes right now from the invested KHS (without auto-invest), after one year, he should expect to make
(1 - 0.0104712963079583) * 10 = 9.89528703692042 USD, EUR, or
BTC accordingly.
Ffffweehhh...

that took some time and brain hashing power, but now I feel better and more confident that my revenues wont disappear very quickly... Of course this is based on the specific 30 payments throughout the specific 300 minutes... but it will have to do...

P.S. I hope my post is not against the rules. If I'm wrong, or if I have any mathematical mistakes (I'm not perfect) please let me know and I will edit it ASAP.

The problem here is we have no clue as to how the altcoin to bitcoin conversion is talking place. That is, what is being factored in. Regardless of whether or not SCC is (or is not) mining, this is likely a config file that the admin is changing a variable or multiplier to adjust the rewards. And there is likely a randomizer in there to help give the appearance of varying rewards.