Are they for real?

I have encountered several homebased clerical jobs on the internet. Perfect for those with regular jobs or studies who need extra cash. The job the way they describe it is simple enough and can be done on your spare time. However, before they enlist you in their job, you must deposit a certain amount to be able to qualify. The purpose of which is to determine if you are really willing to work and for the administrative fee. They say you can earn $500-$1000 a week depending on how much job you finish. I'm skeptical about this ads. I don't know if this is for real. Has anyone tried it? How was it? Please share your insights. Thanks.