Other forms: exclusivities
Exclusivity is a quality of being limited to only certain people or groups. Part of the appeal of an expensive private club is its exclusivity.
Exclusivity, the state of being exclusive, or allowing limited access, has two uses. It can mean "only available to one group," like when a sports sponsor gets a deal with exclusivity, meaning only that brand will be worn by a team. It also means "only accessible if you're rich or cool enough." The exclusivity of private colleges has increased along with their tuition over years. In both cases, most people (or brands) are excluded.