Because at the previous profile comment, you gave no reason backing up your decision.
I think it's way too early, even though I joined a year ago.
I don't think this will be one of the reasons the staff will be taking into serious consideration when they are debating who is to be modded. Honestly, it's going to be an extremely stupid reason for people to judge the quality of your contribution and posts by just how long you were a member of PB. Seriously, why would everyone fuss about a member's join date? It's a registration date, holy moly. No one will judge anyone by their registration date. In fact, it's the last thing on their minds.
And second, it takes a lot of work and effort, especially in lower-activity forums.
I admit, being an aspiring Contributor can take tons of hours off your life. You've got so many things to do, you have to write high quality articles. You have to plan out creative contests. You have to check on every new member's fanfic, whether you want to or not. You have to be knowledgeable enough about the art of writing. Even more, you have to update your fic regularly because there's a huge pool of expectation from the members active around WC. If you look at the big picture, it seems very daunting, right? It's no different from being a moderator.
Frankly, not many members are willing to become Contributors. Even more so becoming a Moderator. There are a many people that just think of PB as a place where they can just hang out, cool down and stuff. They don't want to get involved in staff matters and are perfectly content in being a member. But what about those people who aspire to contribute? They are definitely a different level than the rest of the members.
By reading your comment, you stated so yourself that you want to contribute and frankly, that is very good. Excellent, in fact. Like I said above, not many are contributing (in terms of reaching out) and in reality, will choose not to in the first place. But the fact that you are willing to become a Contributor shows in the comment, your posts in Writer's Corner and pretty much every where else. I salute you because you also have great motivation, determination and dedication. Secondly, because not many people are willing to contribute. I salute you for those words. You've got the potential to become an excellent Contributor if you just allow yourself to be one.