At 10-12 year captain's pay, single pay is the same as a green slip on 2nd - 4th year FO pay (depending on category) so in many cases you're stating you'd fly single pay above 75 every month too. In addition, I don't see too many captains WSing bid package garbage, but instead are grabbing the broken trips after CS chops them up. Sure, there are a few who will WS or OOBWS a standard bid package trip out of open time and fly to FAR maximums, but those are the minority.