My advice, just never spend a dime on this game ever, devs decide to be so stingy about some virtue loot, players should be even more stingy to spend real money to show mutual respect. I agree with you here, emblems have exact same effect on 4 and 5 stars but cost on 5 stars are 3 fold. Whoever designed this is plain stupid, period.
I quit spending money completly, and I’m still killing 12 stars every day, get to global ranking No. 1 whenever I want, finish any request almost fall asleep because they are so easy. Any reason for me to get another hero I can never max because of the stupid drop rate? Absolutely none.