Is there a precedent for someone winning a "complete" pack when they own the regular game?

You should reroll.

i think you are able to get a reroll not sure tho tbh..

Some people are against entering giveaways if they already own the base game, some allow it. It's for you to decide.

From what I know, you don't get a second copy of OMD2 if you get the complete pack.

I think it's the one stipulation you're allowed to put on public giveaways. It's up to the giver to decide if someone who owns part of it can win... and that can depend on the game. Something like Dungeon Defenders Collection is something you might allow someone to win who only owns the base game, because there is SO MUCH DLC.

Personally, I would send in a support ticket asking for that winner to be re-rolled.

Also, it's very rare that if you activate a pack that includes a game you already have that you get an extra copy.

The winner would only get the DLC added on his account to the existing base game. It's up to you to decide if you're okay with it. If you don't agree with this, then ask for a reroll.

According the FAQ/Rules and Guidelines you have a right to ask for a re-roll.

• Don't enter for games you already own.

Orc Must Die 2 Complete Pack will not give the person an extra copy of the game if they already have it in their library.

It is my opinion that you should give it to someone who doesn't already have the game and who hasn't violated any SG rules.

for this game I would request a re-roll. there's not that much DLC at this point. it seems a waste to give it to someone who already has the base game. it's up to you but just my opinion

He wont get a copy of the game to regift, it gets wasted unless its on some list somewhere that I'm too lazy to link to.
In the end in these situations I think it's up to you if you want a re-roll or not.

I would call it morally irresponsible but would have to ask a mod or something i dont honestly know but i would reroll

Typically you reroll when that happens unless you specifically allow it

"but then obtain the Orcs Must Die 2 standalone in his own inventory to regift to his desire (or at least that's how I assume steam works)."

very poor assumption, and totally wrong

he would get all the dlc which is unfair to other people so reroll it mate :)

As others in this thread have pointed out, complete packs generally don't credit extra copies to your inventory unless explicitly stated in the steam store page. Regarding the prior ownership of base game issue, I do believe that it is one of the few conditions that are left to the discretion of the giver, even in a public giveaway. While it would have been nice for you to specify how much of the pack they are allowed to possess, I don't believe it is actually a requirement to request a re-roll.

It's up to you, I personally think you should reroll since he has the base game, and if he finished the base game might not play or just try the new traps and stop playing.

People who do not want to gift a complete pack to the owners of the base game state this fact on their giveaway description. This is the only allowed rule for public giveaways. If you didn't state this beforehand, there isn't much to do, unless you talk this over with the winner and he/she agrees. Or you can refuse to send it and he/she can mark it as not received.

Unless Steam specifically states it, they will not give extra copies of any game or place anything into an inventory.

The combined cost of the DLC is equal to the cost of the game. It's up to you to decide whether to give him the pack or ask for a reroll. If I had to make that choice, I'd look at the content included in the DLC. If it's enough to justify the price, I'd give him the pack.

As for precedent, yes, there is. When giving big packs, people will generally mention what part of the pack can be owned at most in order to win. For stuff like the Dungeon Defenders pack, I've often seen rules like "You're allowed to enter if you have the base game and no more than 3 DLCs".

He don't get another OMD2 copy just the DLCs. Basically you're losing the base game to a person who already have it, it's kinda sad.