i'm by no means an expert when it comes to BT things, but its my understanding that no one gets "priority" per se--more that each persons d/l speed is affected by their connection speeds, whether or not they're firewalled/don't have their ports forwarded properly, and the number of peers connected to.
here's a few sites that you might find some more info at...
http://dessent.net/btfaq/
http://www.infoanarchy.org/wiki/wiki.pl?BitTorrent_FAQ
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