As a consultant, it is your job to make the client's business work without you, and do that better than before. IF you achieve that you will get more offers from the same or different companies. DO NOT think that a consultant can just go on doing the same job as an employee under a different title and employment status. That to me would be tantamount to tax fraud. I think the reader sending you the email has a totally wrong idea of what a consultant does and should never have traded in his dayjob for a quick buck.