You should take a look at topsite. It is worth reading and you'll learn something about "the scene".

These "hardcore" uploaders is most likely having a script that does the job for 'em by downloading the release from the 0day scene trackers. These trackers has awesome pre-times so it doesn't matter if you're having access to a topsite or a private tracker in my opinion.

I guess it's more secure to have access to one of the private trackers instead of being active on a topsite.