Ive been making some notes, and this is the one that has taken my likening at the moment.

$20 a day

1st bet $10 WIN
(if no return) 2nd bet $5 WIN
("") 3rd bet $2 WIN
("") 4th bet $2 WIN
("") 5th bet $1 WIN

My goal in a day, is $40. So double my money.

If the first bet wins and pays less than $4.
Then you start back at the top of the cycle.

Effectively it would become
2nd bet $10 WIN
(if no return) 3rd bet $5 WIN
("") 4th bet $2
and so on.

My day ends when I lose $20 or when I lose on my last bet (the $1 to win).

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GO VOUVRAY