Does anyone know for sure of Treasure Hunter stacks?

[Vanguard]

Gone to lvl 50 and heard a lot of people's opinions but no one really knows.

Would having 2 thvs in a pt, say past lvl 45 with TH2 increase the drop rate compared to 1 thf?

I am thinking it does, but just my thoughts based off of too many things to list, so does anyone know for sure? If not sure, post your thoughts and if you have a strong reason to believe it, say so.

Thank You

[Sinzer]

We had 3 THFs in the party last night and we got a tonne of drops, for instance 2 Goblin helms and 4 -5 crystals per kill.

I think that treasure drops are simple percentages. TH just boosts that percentage for each individual THF.

[Milon]

I've never heard or read any discussions on this, but from personal experience it does seem that more Treasure Hunts increase the amount of drops. I've been in pts where 1 other will have a Thf sub with Treasure hunt and we were getting tons of drops. 4-6 a kill I believe. What I wonder though, is if it effects odds of rare drops. Say you are hunting a NM with multiple Thieves, will the rare drop have an even greater chance of dropping with all those Treasure Hunts, or will it be the same as if there was only 1? I think since multiple Treasure Hunts have led to my groups getting tons of drops, then the more Treasure Hunts on an NM will mean a better chance at the rare, but I don't know for sure.