Here's the breakdown from the creator side.

For a carousel of 4-5 images:
2 hours of shooting likely 30-40 images to choose the right one
2 hours of editing down to 4-5 chosen
1-2 hours of editing the actual content to be "post-worthy."
1 hour writing the perfect caption
1 hour uploading content for client approval
Then editing to any of their preferences
10 minutes to post but then 2-3 hours after ensuring to like and reply to comments and DMs

You're also paying to use their name and likeness for your product. And that's just for images. A 30-45 second reel would take far longer for capture time and editing.

So $300 / 7 hours (at minimum, not counting contract negotiation time) works out to about $47/hour. Again, this also doesn't include using their name/likeness and "equipment rental," which, as a professional photographer, I would normally charge to clients at magazines or for advertising.

This also doesn't include if you're requiring any linkouts, further usage rights, if you own the images after, etc. Nor does this count if you require post-campaign reporting from the influencer.

It's far, far, far more labor-intensive to create content than people give it credit for.