The opportunities feature allows you to track positive replies and attach a monetary value to them, so you can calculate how much money the campaign is bringing you. Watch the detailed information about the opportunities feature HERE.
Opportunities consist of leads with the following statuses:
Interested
Booked meeting
Completed meeting (not closed)
Closed
You can set the default lead value on the Preferences setting, and when the lead is updated to any positive custom statuses, its value will be added to the Opportunities count. By doing so, you will have an understanding of which campaigns are really working well, so you can start optimizing those by buying more domains and sending accounts to scale them further.
Calculate the lead value by using this sheet. Add the ticket size (Life Time Value) and an approximate conversion rate, which will calculate the monetary value.