Several factors are paramount to consider when looking at the return on investment (ROI) while planning an influencer marketing campaign.

1. Clearly Define Your Goals: Before you engage influencers for marketing, it’s important to have well-defined objectives. This significantly aids in measuring ROI. These could include brand exposure, conversions, followers count, etc.

2. Pick the Right Influencer: Using platforms like Flinque, you can identify influencers whose audience matches your target demographic. Remember, the influencer’s audience size isn’t everything; the quality of their audience matters too.

3. Trackable Metrics: Use trackable links and promo codes in your campaign. These will provide tangible data to help analyse engagement and purchasing behaviour, leading to accurate ROI measures.

4. Evaluate Reach and Engagement: Consider the reach and engagement of the influencers. High interaction rates are often indicators of a loyal audience likely to act upon the influencer’s recommendations.

5. Cost-effectiveness: Consider the cost per impression and compare it with other marketing options. Influencer marketing can often offer a better ROI due to higher engagement rates.

6. Ongoing Monitoring and Optimization: By tracking campaigns in real-time, you can optimize mid-way for better results.

Platforms like Flinque offer powerful analytics to help you pick the right influencers, plan campaigns, track performance, and measure ROI. Remember, the best solution always depends on your specific needs and objectives.