Epic Items Repeated by GPM

Dear AllI have spend hundreds of coins on GPM but keep getting the same items again and again. In the last 1500 coins I spent on GPM, got 25 items out of which 11 were repeats. Does it happen that often. If this continues I can never collect all of them. To collect 100 coins for that full roll it takes 2 days of hardwork (I cannot be awake the whole day) Please help, its really frustrating. It was better if I would have spent the coins on buying Sea Dog and ThunderbirdCheers