Airline transfer partners will generally let you use your points to book travel for others (Some have restrictions though. For example, Singapore limits the number of other people for whom you can book tickets). However, it's almost always against their rules to make an award booking in exchange for money or other compensation. As long as you’re just booking flights for friends and family, you shouldn't have any issues. When redeeming Capital One miles for a fixed-value against travel costs you have charged to your Capital One card, you can book travel for anyone.