That could make you .1 BTC in one month... But that would mean you would mess around the forum and post crappy post if you have 3 accounts... So probably before OP complete his/her .1BTC goal, he is already banned from posting in this forum... That's the price he has to pay if he pursue on his goal ... Worth it but not a good way and waste of account and you might get used to it posting things like talking to a wall..
Yeah if you have multiple accounts then there is a chance of getting banned as the quality of the posts will not be intact if you are posting continuously.