The way I see it if you have one or two days of carryover into the following month and you bid another low paying line, protecting min days off will do nothing. Example: A 60 hour line would be approximately 10 work days leaving 18 days off. 2 days of carry-in would yield 12 work days and 16 days off. Protect min days off and nothing would happen since you already exceed the min days off.

If your carry-in conflicts with another 1-2 day trip and the conflicted trip gets dropped (assuming a lot of pilots do this) you would end up with a slew of trips bunched into the first couple of days of the bid month. Can't build much of a line with a bunch of short trips all occurring on the first couple of days of the bid month. Most would end up in open time.