I think there might be a bug with the golden throne red gem upgrade for village. The multipliers for it go from 1 -> 1.5 -> 2 -> 3.5 -> 5.5 -> 8 -> 11, etc continuing in the pattern of incrementing the increase by .5x each upgrade thereafter. The only reason I think theres a bug is it seems like the second upgrade should take it from 1.5 to 2.5 given the pattern all the rest of the numbers have. It seems to skip over incrementing by 1 instead incrementing by .5 twice before going straight to 1.5.
The golden throne upgrade used to start at the x2 gold upgrade, and the 1.5x gold upgrade was put it at some point (along with some other cheaper upgrades) to be something for people to buy earlier with red gems.
Unfortunately, none of the costs of the original upgrades got reduced any, so although getting some benefit earlier is nice, it also just meant that someone buying to that upgrade power later has to spend more red gems overall.