Trying to calculate earnings

As I stated from the beginning I need this to pay most, if not all my bills.
To gain some measure of reassurance I have been looking at ways to estimate over a year how much I can expect as a return.

As  very quick calculation.

I roughly calculated by service the value of stakes per week/ month/ year.
Then I took the yearly ROI
I times one with the other.

This provides a rough total of the yearly return by service.

I took 60% of this as I doubt I will get the same results.

I just about have enough.

I roughly need 10% ROI (funny how most calculations end up at 10%) on the current bank to make this work.

NOW, I look over at The Portfolio Investor for a  bit of inspiration.  I think I'll drop Rowan a quick email and ask what he's manged to pull off in terms of ROI:)