Does affiliate sites work?

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Hi friends Do you know anything about affiliate sites?Last day I got a mesge in my inbox to join an affiliate site for free.Only expense I need to meet is to get a domain name by registering through bluehost hosting services.After registering I've to sent the set up email to them and within 24hrs they will set up my website,they say.They guarantee atleat $100 per day.Do you have any experience before in the affiliate marketing.Or is it another scam to promote a particular web hosting company.Please reply,I am badly in need of advice