Your luck will change. Take my heroes for example, I've only managed to sanctify 6 times in total, yet others have got half angels in their team. My luck in the rune temple is better as I've got a nice range of gold runes but even then I might go for days without even winning a rune fragment.

The point is you get the lucky ones and then you get the not-so-lucky. It does however swing in roundabouts and I have to say its not only the big spenders who reap all the luck either.