Between the medic and the emt on an ALS ambulance, they’re making a total of like $45 an hour. So with employment insurance and all the other stuff it costs an ambulance company like $75 and hour. Over a 12 hour shift you can expect they may run an average of like 4 calls (major spitballing. This varies a ton by location).
But just one ambulance ride at $1,000, which is fairly average for a lower priority ambulance ride would more than cover the $900 in payroll expenses. Supplies, gas, maintenance, depreciation, etc would be way more than covered by a 2nd call. Everything else is just profit.