As everyone already saw, it costs a ton on coins to upgrade your dinos.
Imo you should be granted much more for winning battles…
Instead of 60-150 coins, you should earn 600-1000.
If you are higher level, it costs over 20.000 for an upgrade…
Maybe you can link it with your level.
But it makes no sense that a lvl 2 earns the same as a lvl 10.