For me Legendary Adventures will come out ~$25 more than Ruins of Lastwall, ~$40 more than Kingmaker and Jungle of Despair. For a larger incentive and a number of huge figurines instead of large that doesn't seem like a terrible increase. The cost of a case is the same, the incentive a little more (but the still steep discount), with most of the increase coming in shipping. Overall that doesn't seem terrible, but obviously it isn't great. Looking at a few other sites I still cannot find the set any cheaper.
I haven't been able to find shipping weights for Icons of the Realms cases, but I've found some for bricks. I've noticed the sets with many huge figures break 3 lbs. Sets without or just one huge figure sit around 1.5 lbs. Sets with a smaller set of huge figures seem to fall between. This seems to roughly match up with the jump from 7 to 12 pounds we are seeing in the Pathfinder cases. So this isn't an issue with Pathfinder Battles, but with huge figures. I suppose that might have been one of the factors that made them not worthwhile in the past?
Since Paizo gives a big discount on their licensed miniatures instead of free shipping, we are just not used to seeing this sort of issue that other sellers are probably seeing with Icons of the Realms. Looking at my Rise of the Runelords case the shipping came out to around $50, but I know that shipping rates have changed since then. The case seems to have also weighed 12 lbs.
Maybe going forward the better idea will be have a smaller share of huge figures? Obviously not always the big playset incentives either. Some of the larges in Pathfinder Battles can get quite weighty as is. This is a tough balance. I'm not sure where the line is on weight that causes a huge increase in shipping, but targeting that might be preferred. If huge figures are only present in bigger numbers every third or second set that probably isn't an issue for me.