Something similar happened to me but it was unlimited I bought 2200 like the guy spent around 750 played a match to make trade pile smaller came out had 3450, spent some again and the same thing happened

Something to do with gives double points and then takes away what you spent from 2200 and adds that on

Edit: Come to think of it it might have something to do with the match bonus (I had the +500 coins for loosing aswell). I probably could have done it forever but I tried added an item to club which wsa full and got store disconnect

---------- Post added at 04:01 PM ---------- Previous post was at 03:36 PM ----------

Its deffo more than a coincidence thats all im saying