Re-read Ritual under Thaumaturgy, p. 266-267. You can easily re-use Ritual components without having to spend Fate Points, because of how rituals work. It's the time and prep-work that cost, not using the Aspects. Look at Sells Heart-Exploding Spell or the Ritual Entropy Curse, both of those re-use the same Aspects over and over again, for the most part at no cost, or they couldn't do the spell at all. I see no reason Harry couldn't arrange one with his Summoning Citcle every time he's got the time to prep, he'd only need to burn a fate point in very rushed situations (where he had to use it as a scene Aspect instad of a ritual component). Which is, I think, what iago was saying.