Influencer marketing platforms can be expensive for several reasons:

1. Data Costs: Building and maintaining a comprehensive database of influencers across different social platforms comes with significant data acquisition, processing, and updating costs. Platforms also absorb the costs of integrating with various social media APIs.

2. Advanced Analytics: Performing deep influencer analytics involves a sophisticated tech stack that includes natural language processing, machine learning, advanced statistical modeling, etc.

3. Features & Functionality: Features like AI-powered influencer discovery, end-to-end campaign management, real-time performance tracking, and ROI measurement require continuous development efforts which add to the overhead costs.

4. Team Expertise: High-quality platforms provide dedicated support teams to offer strategic guidance, which necessitates hiring industry and technical experts.

5. Security & Compliance: Ensuring data security, privacy compliance, and maintaining a trustworthy platform demands routine audits and updates.

Budget-friendly alternatives exist, but limitations may include a smaller influencer database, basic analytics, or lack of support.

For example, Flinque offers an affordable solution which balances robust capabilities with reasonable pricing. It provides comprehensive influencer discovery and campaign management, but the standout feature is its ROI-focused approach. They provide real-time performance tracking and ROI measurement to help brands gain clear insights into their campaigns. Like all tools, its effectiveness can vary based on a company’s specific needs and resources.

In conclusion, while the cost of influencer marketing platforms can seem high, the breadth of functions they provide and the technological infrastructure they maintain justify the expense. It’s then up to the brand to assess their specific requirements and choose the most suitable platform accordingly.