Because of all the spam this site receives, member applications have to be approved by a live person before they're allowed to post. I used to be the moderator that did the approvals, but it became so time consuming that I had to quit doing it.
There are only 2 people that do it and they still have their other duties to perform in addition to doing this. Then when you consider they don't work on weekends, it sometimes takes a while to get around to going through all the requests.
I know there are better ways of keeping out the spammers, but this is the method they have employed.
Hope this answers your questions.
BTW, Tom (site moderator) did respond to Amy in this post: viewtopic.php?f=18&t=20521