I'm a relatively young guy at Allegiant, but I have little to zero temptation to go to Delta after I did the long term calculations. I think most people would agree that 18 days off per month is a great schedule. If you had 18 days off per month every month for 30 years that would still mean that you are gone for 12.25 years. It's probably safe to assume that you will spend more like 13-14 out of 30 years away from home if you're lucky.
The industry has us trained to think 4 days away from home isn't a long time, and 18 days off a month is the pinnacle of QOL, but it still equates to a significant amount of time away from family. If you ask most people at the end of their career if they would sacrifice a cumulative 13 years away from their families for an extra $1M they would probably say "No".