Treasure hunt rating, what does it mean?

[FizzGigg]

Since I havent seen anything on this.. or im blind and someone can point me to it.. I am curious for a response concerning the bronze, silver, gold ratings for completeing a treasure hunt.

I have yet to gold star a lower level (toadskin and lower) treasure hunt. Which makes me have some assumptions. Are these ratings tied in to the map itself? As in.. the maps are random.. which we know.. the mobs are random.. which we know.. loot is random.. which we know but.. gold ratings seem to give better rewards. So my assumption currently is, the solo maps randomly give a rating, which in turn is for that specific random roll you just had on the mobs/loot etc. All you can do is pray you find a gold rating map.

Now, I say this because I have even taken a person or 2 with me on these maps and we still did not get better than silver, and sometimes a bronze. Its a bit hard to figure that as we nuked the hunt in less than 20 seconds.. the rating wasnt gold.