It doesn't mean if all your torrent come from DA, all of that include the DA tracker..
Well some of the DA torrents are using the External Trackes.. which sometimes do not include the DA tracker
"at all", so this mean, even though you have upload 1 GB, it wont be save on DA tracker..
http://tracker.datorrents.com:6969/announce.php -->> this is the DA tracker, please check your torrents
To disable the DHT network
If your are using BitComet :
1. Click option
2. Chose Preferance
3. Chose Connection
4. Untick the "Enable DHT Network"
If i not mistaken, bitcomet v0.58 have started used the DHT nodes...