Well its a good information about the income of the plans purchased,i belong to those that arent getting a penny fees above the income,but why new investors getting payment? The new energy should be to all miners they has?Makes no sense they pay to new members and stop pay the oldest,even being different contracts.
When a person purchased hashpower in September 2014 their contract is based on the farm and the type of miner the hashpower was hashing on. At the time the miner would have been a power efficient model, but as you should know, over time, newer hardware comes along that is more power efficient and uses up less electricity etc.
As time goes on, GM build another farm, perhaps in another country with different electricity costs and newer miners, perhaps a newer batch of an existing model which can be stable and better performing and then can offer users that purchase contracts from that facility lower fees going forward.
Then in September 2015, same thing again, lower fees, again probably because of newer hardware and better electricity rates for that specific farm, so those that reinvest in hashpower from that point onwards get a lower fee.
I also think that as GM build new farms, they evolve and learn from the previous farm so the next farm perhaps is more cost efficient than the last to build and set up. Could be lots of factors.. If they build a new farm from scratch then it could employ better cooling systems where as if they are using an old hangar or old building then they have to try and build a farm around what they have already.
Regarding New investors just getting the new fees, You have to remember that its not new members getting just the new fees, older ones too can reinvest over time as well.
It is not a case of GM looking at your account and thinking.. Ok this user first purchased in May 2014 so all their contracts are at this rate of electricity ...for ever...Every time you purchase it is a new seperate contract so old members get the same fees as new members get whenever they purchase...In my account for example I have contracts with many different fee types..
I do not get payouts on my older contracts no more but I understand why I do not and just get on with it. If Btc/USD price on Sept17 had been higher then we would have still been getting payouts and you can not really blame anyone for that. People can always try and blame someone.. Genesis Mining gets the blame, but then we could blame Bitmain or Spondoolies or KNC too or the company that made those new chips that made everyone buy the next generation of miners in August and September that increased the difficulty by 10 percent over a month which also helped contribute to the older contracts to stop paying out. But this is Bitcoin mining and it is risky and this is how it is unfortunately.