So let me think:
When i buy 200GH/S it costs me 200Dollar
0.00002780 per Day/GH/S = 0.0133 * 200 = 2,66$/Day
When i buy 9 Hashlets it costs me 200Dollar
0.0006721 per Day/MH/S = 0.0006721 * 9 = 2,7$/Day
So why i should use the GenesisHashlet???
You forgot the daily maintenance costs:
200GH Hashet Genesis: $0.01 5GH so 200GH 5 GH = 40 x 0.01 = $0.40 day maintenance, so you keep $2.26/day
9MH Hashlet Solo on Zenpool ( 0.00063912 BTC on Zenpool according to my rates page): $0.08 1 MH so 9 x $0.08 = $0.72 day maintenance, so you keep $1.98 day
This is of course if your calculations of what you would earn are correct !
According to my Zenpool stats your 9MH Hashlets would make 0.00063912 x 9 = 0.00575208 BTC day = ~$2.77day before maintenance deduction (so ~$2.05 after)
Maybe I messed up some calculations somewhere ..
Make sure you calculate the maintenance fees in when you do a ROI or daily profit calculation!
-edit-Average payout I posted does not specify if that's 1GH , 5GH or 10GH. I assume 10GH. Can anyone confirm?