An ideia to how to spend coins
I think there's could be something like 60k Coins = 1 bulb 20 bulbs = 50 rainbow stars It can make veterans spend some coins and give some rainbow stars has a reward.
Forum Discussion
They should be at a resonable rate, that would be fine for popcap, and I dont think that 10bulbs = 100rb stars is resonable.
You can get bulbs pretty quick and your rate would be way too easy.
I have another idea instead of earning coins after a season in battle arena we pay to get in and earn more after a win or earn 0 coins after a loss. The higher the rank you are the more coins you have to pay but you earn more.
For example rank 1-100=5,000 101-300=10,000 301-500=20,00 501,800=50,000 800-Max=100,000 (I don't know what is max rank)
You get 2x coins if you win and if you leave you automatically lose coins.
I think this will make battle arena more fun and enjoyable.
There will be ranks but only rainbow stars.
For stars it would be C- =10 C =20 C=+=30 B- =50 B=70 B+=100 and so on.
