Metadata and ontology repositories are critical to ensure the discovery of existing vocabularies and the reuse of vocabularies and/or individual properties. However, these infrastructures should take into consideration the decision making process and criteria for the selection of a vocabulary of individual concepts or properties. Usage data in particular are important and can reassure on the maintenance of the vocabulary by a third party. This data is to some extent available through dedicated tools, such as semantic search engines. We illustrate the need for integrating usage data in the vocabulary infrastructures in order to support the reusability of vocabularies and therefore interoperability and data usability in science.