I myself think the idea of fans making a numbering system early is great,but the way it is often executed is disgusting. It is usually done to suit the needs of a small group of people who often go to a hotel or home and sleep and shower and eat well and drink, and then show up after other people have been waiting in line for 10 plus hours and suddenly say they were numbers 1-20 from last night.
I'm not sure how many of these lines you've been in, but the people up front have usually been in line a lot longer than 10 hours. None of them shows up at the end of the day saying they're number 1-20, these lines don't work that way.