that brings up a question for me. when you say $15K/2weeks, is that for a task that can be accomplished by a single person (2x40h), or do you have to break the job up amongst other people?
Just off the top of my head you'd need to think about winning each contract, paying taxes, holidays, health cover, professional indemnity, sick leave, misc business expendables (like office, phone, ISP), the list goes on.
Don't get me wrong. It is still good money I'm sure.