im going to reduce this to 10 posts. i think you are right on, styropyro. now that i added the image verfication and email verification spamming has been reduced even more. the main purpose of the post limit is to prevent human users (not bots) from spamming.
i think 10 posts is a fair number.
i will get this change done tonight before i do backups. i will also be changing the error message to tell members that you need 10 posts before posting a link. the old error message was too vague.