Player level in the game has very little impact, the only real difference being an increase in Energy cap.  As players advance they consume more resources, and silver is always in short supply.  

I suggest increasing silver rewards from daily quests and daily login rewards based on player level.  I suggest multiplying the silver reward by (1 + 20% x Player level).  So a 5,000 silver reward at Player Level 50 would be 55,000 ([1 + (50 x 0.2)] x 5,000). 

This would provide a benefit for leveling and also help a bit with the silver shortage experienced at higher stages of advancement.