Note that on the group buy threads that the shares were sold at 0.1 btc eatch. The price included the 600 shares mining for reinvestment.
Right now, that doesn't look very good:
http://mining.thegenesisblock.com/a/badca74a9fAt current values, a share yields 0.0287, and even that is ignoring the expected 8 PH/s that should hit the network by February.
If you include the expected ~600 difficulty in a few hours, a share yields 0.0245:
http://mining.thegenesisblock.com/a/a402d3e97dThe increase is slightly lower right now than the calculator is listing due to a drop in network hashrate about a week ago, but 0.036 is at least 50% over possible revenue.
I'd offer you 0.018 per share, but I see someone already beat me to it. If that offer is withdrawn due to payout shortly, though, that would be my offer.
.b
A quick note on your calculations. The 5% you have setup is incorrect. As I took my fee in the form of shares not on % of the profit. So each share hashes at around 500Mhs currently to be 550Mhs when Jupi 3 is RMA'ed which finally got approved and will be sent out early next week.
In short the fee is already calculated into each share and there is no need to take it out when calculating profit on calculators.