Has anyone here actually gotten positive ROI from influencer marketing?

I’ve been testing creators/TikTok influencers to promote my app, and honestly it feels extremely hit or miss.

Some creators have huge engagement but almost zero conversions.
Others ask for insane rates and can’t explain their audience quality at all.

What are the biggest red flags you’ve learned to watch out for before paying influencers?

And how do you guys evaluate whether a creator is actually worth it?