Gather round children while I tell you a tale
Once, there was a lurker called Rob. He found the DIS and read the posts and played through HildasMuriel quiz for fun without registering.
Then, a new quiz came along, provided by a person called Small World. Having started playing the new quiz for fun, Rob decided one day that as he seemed to know most of the answers so far, he would register on the DIS so he could start playing the quiz.
So, Rob filled out his registration form, then played some community board games to quickly get to the huge 10 posts required to PM the quiz mistress. For the rest of the month, Rob kept pretty quiet and simply wrote "PM Sent".
Eventually, Rob won the DIS quiz and created a reputation for answer questions quickly. He got to know some of the other DIS members well and suddenly his number of posts reach 800+.
And the rest, they say, is history