It's like going to casino and bet on red on a roulette board and be surprised if by betting 4 times you don't win neither once. Happens.

Btw those money aren't wasted. Buy masked man in the shop and attack magatamas, you'll get your shining minato next time he appears in an event where for sure you are able to buy 80 fragments of him 1 by 1, like in fateful choice event, for example.