How about this thought...
Let posters spam all they want, and when it comes time to see if they get a shell, just click on their username, show all posts by user, and see what percentage of their posts are spam.
It should be obvious to anyone that comes in with a very serious intent to participate, who READ the forums, not just looking for a place to dump something, but who want to join you in being "guardians" of a great place to be with serious professionals, that the requirements for a shell account are to be serious about being part of "the team".
It is the same with a true multiplayer game which I am part of, we get new players in who don't know the power of teaming to create a great experience.
This is the same concept that I want with my website as well, these all have a similar requirement... be someone we can get to know, because we get the ability to trust you more if we know you.
Not just that you have a name tag once you sign up, but that you have a personality, a life, loves, desires, interests, abilities, talents, and that sort of thing.
The more posts people make where they actually reveal their soul, and allow you enough info to either love them or hate them, at least you know they are real.
So, let new members come in and try to beat the system, but let experienced people be the judge of acceptance, because you can tell the quality of people you want by their posts.
15 good posts are plenty to tell, and those will likely be accepted.
15 posts where 10 are spam also is very revealing, and it is exactly what you want. Keep the limit small and make it so that every posts counts.
Those that randomly just post without thought will reveal that they are not what you want.
This is a private forum and people need to realize that you CAN choose who you want to bring in.
15 posts is nothing. Especially for someone with an opinion.






