Borrowing GLBSE asset. At which rate would you loan?

[Namworld]

I'm looking at creating a guaranteed borrowing asset with a fixed minimum weekly rate. Basically, any shares represents a loan to me.

Shares would be:
- Cashable back into Bitcoins on request (with some delay)
- Guaranteed by contract on any of my personal assets/income (I have fully deposited all my private information on GLBSE)
- Forced buy back at fixed rate (Same as selling price)

What weekly/monthly rate would you be willing to buy into such loan? How much would you lend? Simply testing grounds.