Seriously, VW loot system..come on.

[Runespider]

Doubtful it's a true random (in SE's case), and closer to pseudo random.

The way I assumed it worked was it did a random (using the ingame random system with different end-number and hidden from chat) between 1~5 and if it rolled a 1 you get a HQ slot to load. Then it did a random again betwen 1~200 and if you get a 1 it loads the HQ item, if you get 2~10 you get the 2nd item, if you get a 10~50 you get the 3rd item, if you get a 50~200 it loads a plate....etc depending on number of possible HQ drops.

As for server load, there aren't that many people doing VW at once to make it an issue.