I actually get that one a lot and there's a reason not to use Parameter Store and that's intention.
Yes, Secrets Manager is more expensive but if you clearly delineate between sensitive data (Secrets Manager) and configuration options (Parameter Store), you're less likely to run into accidental leaks down the road. It's a nice bit of operational security to help show you and the team what needs a high level of care.
...but yes, Parameter Store is significantly less expensive
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