First, you obviously cannot work for $5 unless you're located in a low-income country. They are putting it up for $5, because they don't know how much it costs. However, you have to be careful to make sure they are competent so you're not ending up with a client who does not value your time.
Second, getting a job for $1,000 (when maybe it's really a $1,500 job) with the possibility of future work is better than not getting that job at all, in most circumstances.
First, you obviously cannot work for $5 unless you're located in a low-income country. They are putting it up for $5, because they don't know how much it costs. However, you have to be careful to make sure they are competent so you're not ending up with a client who does not value your time.
Second, getting a job for $1,000 (when maybe it's really a $1,500 job) with the possibility of future work is better than not getting that job at all, in most circumstances.