If a site does not have Dynamic parts or they don't really want to update content themselves you don't even have to SELL IT.
The real benefits I see on general is
1) the site can be as fast as it can be as it needs no database lookups at runtime
2) best security as there will be no login functionality to be compromised
3) Those can probably translate to reduced maintenance costs depending on the automation you set for the deployment workflow and the frequency of deployment
EDIT: Just realized the post was from last august
Every comment counts. Thanks, Giorgos! 👍
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