EAS is an ugly thing. It's the lure of easy money for those who really don't know the aviation scene.
The only way EAS works is if there is some kind of significant geographical barrier between the passengers and the next step in their journey. Cape Air is a great example...because, water. Living 90 minutes up the Interstate from where "SuperMegaAirlines" flies out of, not so much.
You need to be living in the butt end of nowhere these days to not have access in two hours driving time to some kind of air transportation, and probably "major league" at that. If you do, that's fine, but that doesn't mean you and the three other people who live out there are enough to support air service, even with EAS subsidies. I don't mean to sound cruel, but that's the way it is.
As someone pointed out, the guaranteed profit margin is slim, the airport managements are always looking to replace you with jets (because everyone wants jets, whether they can support them or not), and there is always someone out there who thinks they can do it cheaper. And honestly, the airplanes are too expensive for the routes. The cities involved with EAS almost always develop a hate/hate relationship with the incumbent carrier, leading them to root for ANYONE else to pick up the contract at the next cycle. And the cities have an inordinate amount of say who gets the contract, or better yet, who doesn't.
You need turbines, and that means money. That soaks up all your money. That means you're hiring ground staff at minimum wage, because that's all you can afford. The good news is minimum wage ground staff gives minimum customer service, which does wonders for repeat business.
I worked EAS back in the days before the earth cooled. At an out of the way town, that was 2.5 hours from someplace a major flew, we got, on average, 3 passengers a departure. We made another stop en-route to "ReallyBigHubsburg", and we rarely had more than 7 people get off and airplane built for 19.
"Well, derp, Richman, why didn't you use a smaller airplane?" Because the EAS contracts specify the type equipment, and pressurization was one of the requirements. This route could have been EASILY serviced with a 99 or even a Twin Otter. If you have one engine burp, or you take bird strike....poof goes your profit.
Is there money in EAS? Yup, but it ain't from running airplanes. It's in monopoly fuel providers, aircraft leasing companies, de-ice fluid suppliers, sign makers, officer furniture rental outfits, human resources/payroll management services and expensive "management consultants/brand management firms".
Basically everything BUT running airplanes.
Funny story. So I was looking to make some extra scratch during my tenure at an EAS outfit. Airport was out in the plains. The cost of living was actually very modest and the carrier actually paid above average, but there wasn't much going on. So I go to the airport manager and see if they need someone to cut the grass.
Turns out, "airport lawnmower" is a HIGHLY coveted job. County job, full benes and paid about twice what I was making. He told me that not only was the job highly coveted, but you had to be "juiced in" to get it (meaning you had to know someone in the county). And it wasn't just this place...EVERY airport I've ever been based out of has been like that.
Richman