When you make the purchase you can choose from a list of premade ways that you get it. Inheritence being one of them. It causes no normal delay or anything really big... mainly a small mini-event for you, where a mob finds you and tells you about your inheritence(if you chose that one).
Those that make very large purchases can opt to have a custom mini to medium sized event to get it, but obviously they would have to wait a bit before they recieve them as the Admin will have to approve the event and run it.
EDIT:
Obviously not a "perfect" system, but far better than just *poof* here ya go. When we made the choice to make Angelstone an IC item, we wanted to make sure players had some IC way to explain why they got it.
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