It´s kind of frustrating no economy balance from the developers. My suggestion is this:

1. Non VIP Premium players:
- Reduce upgrade cost and time by 25%
- Increase silver battle rewards by 10% (according to the actual silver rewards).

2. VIP Premium players:
- Reduce upgrade cost and time by 50% (in comparison to Non VIP Premium players).
- Increase silver battle rewards by 30% (according to the actual silver rewards).

The developers need to make VIP Premium atractive enough to their player base. I am sure many other players will be more than happy to pay VIP Premium knowing that it is actually a good deal to pay for it.

I quit paying VIP Premium, mostly because it makes no sense to pay month after month just to get frustrating by a hatefull economy even paying VIP Premium.