Huh?

LG. We have a free $100 be I use it to back SR1-7 today I take fixed odds of $3.

I then attempt to lay it at less than $3 but can't get set so lay $50 @$3.20

If the bet wins I win $200 but I have a liability of $110 @ BF so overall I am $90 in front.

Now if the bet loses I've lost nothing as it was a free bet, BUT I collect $47.50c in my BF account (after commission) so heads I win tales they lose!!

There are better scenarios than this but I'm just showing a profit can be made anyway.

Like we say in Yorkshire "there's more than one way to skin a cat"