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...I offered to give away a copy of the game to one of those who takes the survey (randomly chosen), which apparently is against the rules. Although I see several other games there offering some sort of reward to their testers... so not sure exactly why it's okay for them and not for me.
Simply put, it's against the rules to advertise random giveaway contests. BGG runs their own paid-for contests on the front page (which work in a similar way; answer survey to be entered into a draw to get a game). Hence you should understand why advertising your own giveaway contests in the forums goes against the rules. Just ask the questions you want, post a survey by all means but don't say by doing so you will get a random entry to get a game. Ask for playtesters, choose specific people/groups to test your game. That's all good, just don't make it a 'Contest'.