Coins keep decreasing w/o buying any boosts – Diamond Battle Review

I got a 100,000 coins just for starting the game,but my coins keep decreasing every time I play. I haven't bought any boosts..it seems like each game I play no matter which mode my coins decrease.. The ones I earn in game don't add to my total either..what's the point of playing if coins I earn aren't added. Does it cost coins every game or something? Very confused..
Review by **JustMeLeslie** on Diamond Battle.