I'm not aware about gifts etc. but I will say this.
Even IF someone puts a bait in order to gain something, it is up to you to just eat the bait only and avoid the hook, in which case you have gained something. So in the end it is up to us to make the right choices.
I try to judge what I read and and not the person who wrote it. I see this forum as a continuous brainstorming session. Good, fool, old and new ideas are presented in various topics. It is up to you pick and choose those that you like or think can take you a step further. Or present your idea and get some feedback.
This way one makes clearer judgements. It is to hard to determine the trustworthiness and value of a person in real life, let alone in the web. So it is much safer and easier to focus on the ideas presented and evaluate the specific ideas instead of the person.
So, my motto would be:
Use your judgement to evaluate the ideas, ignore the BS, take the best of everything you can.