While it certainly sucks, that's the risk you take and is not related to materia tier. Adding Determination III to my scroll I thought I had plenty for the last two infusions (had 10), I ended up having to buy to finish up.
Meanwhile some rich dude(tte) somewhere infused to max without a single failure along the road.

Only around 20 or so spell speed left until I have Thyrus Novus in my paws!