>> Don't tie up your cash unless you have to.

What are you doing with your cash/profits that is earning a greater than 7% return each week?

Do you have another project has an even greater return?  Or do you just like to spend money on consumer items?

I cannot think why you would put more into cash than enough to pay the minimum life essentials, if the alternative was to invest money at 7%/week.  I'd not solicit new funds, pay off the original investors, and use my own money.