In the ancient era looting a district give 9 gold on both normal and endless speed.

an Endless district take twice as much production to make and endless gold only buy half of normal gold.

Expected result : Loot scaled to cost on endless gamespeed.

Same might go for animals sanctuary  that give 5 food on both normal end endless. You end up the animal spawns for good. on normal that give you 1/4th of a new unit. on endless only a 1/8th