From: Phoenix, AZ
I have Tracker data showing ~1k Supplies a day loss to bombardment/airfield strikes. Not overstacked.
However, 113k can last a long time if the loss rate is not relative to the amount stocked.
And a secondary question is, how much supply plus ship/aircraft damage is he incurring in causing a 1000/day loss? There's no free lunch, but you can make the exchange equation go far in the defender's favor if you don't overstack and get in a supply pile before the door closes. You can't hold an atoll if the other side really, really wants it, but you can make him pay. Which is how it really was.
My concern is not the overall defendability of the Atoll, it's the death by nearly immediate supplies attrition. For sure, I'll be stacking MUCH more supplies in my other atoll's, but defenders do not even get a fighting chance if they are completely out of supply after a week of combat. Not even the defender's organic supply is safe, as they've burned through that with constant bombardment orders and aerial bombardments.
As far as the cost of taking the island, I've done significant damage. My CD guns never were silenced and have torn up several xAK and xAP's. His air forces have taken nominal damage with at most, heightened operational losses you'd expect from several days of combat on single engine air frames.
What I'm taking away from this experience is...
1) Stack up WAY more supply.
2) Forts help, but at the end of the day wont save you.
3) Atoll's need AA, as much as you can fit without giving up too much Arty/AV.
4) Life sucks in general without a Navy to defend your Atoll's.
Grog Virgin fanboy