Case. Niche psychology. Author's marathon.

Task: gather a group for a psychologist's author marathon.

Results:
Spent $74.28
Received 34 messages
Minimum message price $1.40
Average message price $2.18
Conversion of messages into sales - 21 messages.
Conversion of 61% achieved due to the client's ability to work in direct.
Marathon price 900 UAH.

Let's convert everything into one currency and summarize:
Spent on advertising budget ~ 2970 UAH (74.28*40)
Paid for participation in the marathon 18900 (21*900)