How many people typically buy marketplace items?

Currently it is not allowed to sell marketplace items that depend on other marketplace items. Believe me, I really want to do this and have the pipeline to support doing so and I think it would be pretty popular, but alas, this is not a possibility. At least not yet. Make your thoughts known on the marketplace feedback thread or tweet @UnrealEngine on twitter, please.

Its definitely more in the $15k range.