Well Gouki, I had a friend inquire about one of those "Would YOU like to earn up to $80,000 from the privacy of your own home?" ads. What he found out was that he had to stuff envelopes with some sort of flyer, I can't remember exactly what it was. Anyhoo, he would be paid based on the # of envelopes that he filled per week...to be honest it was some crazy amount like 15,000 or something...needless to say he gave it a shot and quit after 3 days. I would give it a good hard look and ask a lot of questions...if they get irritated about you inquiring so much, they're probably not going to be too legit. Just make sure all of the details are laid out on the table before you (or your friend) sign up! Get EVERYTHING in writing before the work begins or you'll be sorry later...
Mike