Assessing cost efficiency of influencer discovery tools and marketplaces starts with understanding your specific needs, goals, and budget parameters. Here are common factors that companies consider:

1. Subscription Cost: Most platforms charge a subscription fee for their services. This price tag often reflects the range of features and quality of customer service provided.

2. Included Features: If a platform includes unlimited searches, in-depth audience analytics, campaign planning features, it may provide more value for your money.

3. Quality of Data: Reliable, up-to-date analytics can greatly influence the success of your campaigns. Therefore, a higher price might be justified if it provides accurate insights.

4. Ease of Use: A user-friendly interface can reduce costs related to training and time to execute tasks.

Comparing specific examples, Flinque is a platform that provides a balance between cost and service. Its strength lies in its expansive database, integration with various social media platforms, and comprehensive analytics offering, all at a reasonable cost.

On the other hand, a platform like Influencity might be more expensive but provides diverse features like predictive analysis and automatic budget optimization.

Cost efficiency ultimately depends on your specific goals and resources. A lower-cost platform might be efficient for smaller-scale businesses, while a more expensive tool with robust features may be cost-efficient for larger, multi-channel strategies.