Let me shortlist a few things.
1. Pay on time.
2. If a pilot is expected to be on call 24h / 365 a year it should reflect in the paycheck.
3. Rotation 2 on 1 off or something like that would be desirable. This would allow crew to go home or and plan ahead. Otherwise a schedule supplied atleast 2 weeks in advance. This does not usually work with VIP or corporate ops so a rotation it is.
. Benefits such as medicare, retirement, profit sharing etc.
For me. Well I consider flying important. The more flying and less sitting around the better. I can do that sitting around when I retire.
JJ