I tried to game the system, and my IQ went up for a few times, and then started to drop like a rock.,... so, I might have to cry..
If you get the wrong answer, then it seems to go down.. otherwise, how many points seems to be a product of getting it right and how long it takes. I would imagine that there might be a percentage aspects to it too.. so if you are rated with having a high IQ, then it is more difficult to make it higher by a large amount; however, if you are rated with having a low IQ, then answering correct will raise your IQ by a higher amount.. so there is still hope, yet I am thinking that if you cause your IQ to go to zero, then you might not be able to post anymore until the game is over, which is probably 24 hours from when it started... that's my tentative guessening about it.. at the moment.
Edit: Maybe also the questions might become more difficult if your rating goes up? perhaps?