As we can see, leveling up our kings at high level (let’s say from lvl 90 or so) takes really long time and gems if someone would love to do that. However, now there is almost no real benefit for becoming a high level king. The amount of stats increasing is subtle, while the amount of food you need to spend for each raid is very likely to grow so fast. The strength of available granny legendary items is increase in a linear behavior (if I’m correct). So it’s make almost no advantage for really high level king when attack a base (assume that all spells are maxed out), but on the other hand, high level kings often lose so much skulls at war season. In a league, high level player need more food to raid, so he cannot attack as often as lower level players. So I have some small suggestions:
Increase the stats more when lvl up. It should be proportional to the amount of XP points that need to level up.
Have more chance to meet legendary items (not the sale off items) that can buy with gold
Lower the difference of food amount that required for each raid when level up.