Long term gyms being held will pay out much more (24 coins per full day instead of 10), but simply getting in is not rewarded much (1 instead of 10). The object here is longevity, but it must be balanced with turnover. It pays to heal your poke and team, but only if you eventually let go. Interesting concept.
You can also motivate the pokes in front of you, so attacking with a team can be strategic. If someone leads with their blissey, others can drop in a snorlax, then a vape, and others after that. The first ones will soften attacking teams, with the remainders finishing them off. The first ones can be easily motivated and healed to create a wall. Or, the reverse can be true. Stack with big attackers to deal damage as weaken attaching tabs and let a tank like blissey or snorlax finish the fight. It'll be interesting to see what the balance comes to.