5 MH/s produces ~0.02 BTC per week and that is before electrical costs, before the reward is cut in half, before your profit, before equipment losses/fees/outages/etc, before difficulty rises. How exactly are you going to pay 4% interest?
5mh/s is around .024 btc per week which would me 2.4% interest on a 1 btc share. Atm my shares are going for less than 1 btc which first off increases percentage right there. so .024 out of .8 is 3.3% interest.
But I would like to look at it as if the stock was worth 1 Btc as that is the goal, actually 1.1 btc. The way that I do mining is both Pay per block and Pay per share. If on a bad block (one that takes longer than the average number of shares based on difficulty) once the total number of shares hits the point at which it is equal to what the difficulty is at I then immediately change to Pay per share. Then if the block goes on for 10,000,000 shares I would still be earning the standard amount and still earn 20% of the blocks value that I would have earned if I had stayed using pay per block. Immediately as the block changes I switch to Pay per block that way if it is a great block ( on that takes less than the number of average shares based on difficulty) than I would earn the full percentage that I should be paid for that block.
Anyways thats how I do it and I have always been able to make far more than if I had just left it on either Pay per share or Pay per block the entire time. This is what gave me the idea to offer that to my investors.
I do not pay electrical costs so that is not of concern and with all other maintenance and other fees that may arise are not the responsibility of the share holder.
The share holder earns either 5mhash/s daily profit or 1/1600th of the farms 8.2gh/s total revenue whichever is greater. The lowest that I should make in a day is 3.8 BTC but most often I will make 4-4.5 btc and I then payout the extra earnings to the share holders. Now even on the worst of days where I have to leave my farm on Pay per share all day long it will still make the 3.8 BTC which divided up pays each share holder there 5mh/s earnings no matter what. As was yesterday I only made the very low 3.8 btc and therefore paid out the earnings for 5mh/s to each share holder
Every other day this week so far I have been able to earn more than what would be average and have passed the earnings to the share holders.
Now to finally get to where the 4% comes in the minimum would be 2.4% if each share were at 1 btc at current difficulty. But since I pay whichever is greater (the 5mh/s or 1/1600th of 8.2gh/s farm revenue) and 50% of the time it will be higher on average then 4% would be a safe projected earnings. The 4% is not guaranteed as it is 2.5%-4% but it also isnt guaranteed that it would not be higher than 4% either. (Though I wouldn't expect it to happen often).
As well as the name of the game is expansion. The plans are to further grow the MMM and be able to produce more profits. And if so chosen by the holders after we have expanded if they wish to release more shares (that would fall under the same contract but different farm therefore not diluting the shares as they would all have equal payouts) then the process would continue
As is with the systems we have set up currently the 8.2gh/s farm which is paying share holders and the just about newly finished 2.4gh/s miner we will have more than enough to cover all expenses that may possibly incurred by paying the bonuses to the holders as well as pull in more revenue from that source to further expand.
I hope this answered your question.