OK, I'll bite. Assume a party of 4 individuals. That's 5 6th level spells per person (acid, cold, electricity, fire, sonic.) A 17th level cleric has 10 spell slots of 6th level or higher, not counting domain spells. That's only enough to cover 2 people, so you need to have 10 *more* spell slots of 6th level or higher from your wisdom bonus. In order to have those bonus slots, you need a wisdom of *40*. And that's only if you want to give up ALL your non-domain spellcasting of 6th level or higher. No heal, no greater dispelling, no LOTS of stuff. Granted, night before, etc., but that pre-supposes no nighttime encounters.
And if your group has more than 4...
Something seems off here.