Do you mean this site?
Yes, I try and be first to answer (I've seen a few questions where lots of people answer a thread and the latecomers get the thanks and not the first few - I've also seen people add the correct answer days after the original question was asked)
Best answer: Depends on the question. You could award it to the first person who answers, or, someone could give a really detailled answer and lots of advice/help.
There are a few who ask and never give thanks - yes they do get slated.
Is it OK not to acknowledge answers? - what do you think?