Lets put a little perspective on the money
The minimum for a day draft is 6.75 hours at you hourly rate. Now asuming your hourly rate is for a pp1 FO is £37. That is £250 so £150 net. Not great but thats for the lowest paid pilots in the company on shorthaul (pay point 1).
How many of those do we have?
I have just done a 3 day draft trip which grossed at about £1800 and I am a fairly junior Captain.
BTSM