They aren't saying "Oh, you asked if you are ready to be staff, so no, you can't just because you asked." They are just simply saying that if you don't know if you are ready, then you aren't ready. You have to be confident that you can be a leader.\
I think that I would make a great, but I break market rules a lot, so I would never get accepted. It's just a matter of if you are ready for the responsibility to lead the toribash community, be active, tell people what is right or wrong, not break the rules that you are enforcing, etc. If I am still playing toribash in a few years, chances are that I will try to become a smod.
And no, you don't have to have a high post count, but you should have experience with being a leader, and experience with toribash. If you are really confident that you can become a staff member, go for it. Just keep in mind that if you can't even help yourself, you won't be able to help other people.