It costs around $150 to file articles of corporation/llc, and then an annual report is $99-149 depending per state.
EIN is free. You can do all above, in less than 30 minutes.
Not to defend, atlas, or this or any other service, but if they act as an agent or offer a virtual address, they may be why the cost is high. You do need a physical office address, even if it's a virtual office, for service, and paperwork.
You should be able to find the agency/agency of incorporation for the state - https://corp.delaware.gov/howtoform/ this is for Delaware, and right there #2 is registered agent.
Depending who you go to for virtual office, it may be $50-200/month.
Now, is it a business idea to offer this service yourself, rent a space, and also have an accountant, - yes.
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But it's pretty cheap in general, other countries in the world, the cost of doing business for this meta/paperwork is double or triple.
In Indonesia, Doing a PT. PMA, sort of similar to a LLC, minimum setup cost is about $4000, but it nets you a visa.
Japan, requires $50,000 fiat, getting a hanko - and while it gets you a visa, is much more complicated.