Shaun,

Look at todays results and anaylse it by price range.... what do you notice ?

I suggest splitting it into the following categories:

Under $5
$5-$7
$7-10
$10-15
$15-$20
$20-$40
$40 - $100
$100+

You should see a trend in where the profitable lays are.

For instance I came out $127 in front today where as you showed a loss.

It may make you rethink your max price $20....