Group giveaways

They can. But if support catches them, they will get suspended. And, as far as I know, if support notices a lot of fake received in a small group, it's perma ban for all for attempt to cheat the system.

If a giveaway has less than 5 entrants, there is no CV awarded

You need min 5 entries for CV btw.

yeah as everyone else mentioned , you need atleast 5 entries in a giveaway .

Otherwise you can just whitelist a friend of yours and trade him a game ... then mark it as a giveaway :P

As for the ones with 1 entry , there are those groups where you need to do giveaways and keep a ratio Given / Won ... so sometimes its normal for people to not enter for a game they dont want , since it will require them to give away a game in return .

Something like that .

What if person C or D or E or F wins? Can only work if all 5 just bought Skyrim.

Yup, they can. You can have game on your account and mark it as received before syncing. (The game can't be won previously on SG, because winning more than one copy of game is reason to suspension as well)

But if they can do that, i doubt ppl would check that deep :P They would see he has the game and leave it at that prob

Accounts are synced once per week, so GA could last for 3 - 4 days without problem.