It can take one post or 10.000 to be taken seriously, depending on what you write and who reads it but it takes only one single wrong post to lose this again.
If you wann be taken seriously just be seriously and there will always be people who take you seriously. Some do it in a funny way, some agressive and some just by reading and not replying, you will allway have all of them, hell even crazzyman has some fans :)
@Galaki: I liked your slime avatar :)