How do Cantrips interact with Scrolls?

[The Vagabond]

I'm just wondering, how do Cantrips interact with scrolls? I know they are considered half-spells, but let's say I'm a bard, and I have a scroll of Ghost Sound, when I cast the spell on the scroll, since it is a cantrip, is it used up? It says that casting from a scroll is basically like casting a spell, but it also states that they are only usable once.

[Psyren]

Yes, it gets used up. This is basically the trade-off for having access to more cantrips than your class allows you to have.

If it were not, then a sorcerer/bard could have access to every cantrip in the game at-will, while a wizard would not be restricted to the ones he or she prepared.