I get ~0.2 - 0.4 a day on p2pool having 6GH/s so your numbers are correct (sadly)

the sense of 5 posts is.... none, better way would  be 0.01 or 0.005 btc to get full access.
People would think twice before troliing

Bitcoins have pretty small financial liquidity at this time. So it's resonable to invest only small amount of money - max few thousands $. If you buy fe bitcoins for 1M $ stock price would propably rise a lot.

not yet, AFAIK

2 rigs with 9 x HD7970 ~ 6 GH/s