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This is a question that has many layers to it. Firstly you need to understand the purpose of being invited as an associate. The benefit of being an associate is that you can be a part of a larger organization with a greater reach and resources. Once you accept an invite you will be able to assist with any activities that the organization is conducting such as missions or free mode events. You can also take advantage of any perks or privileges offered by the organization such as discounted prices on vehicles and properties. It's important to weigh the pros and cons before making a decision.