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Server vs serverless cost perspective
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One benefit of serverless is around security use-cases. Often core functionality like validating and signing certificates or identity/access tokens is quick and not so frequently called, but is vital to the wider systems.
With Lambda, you can put this security sensitive code & config in a separate AWS Account with highly restricted access, and pay $1-10/month for peace of mind.
Developers can continue to work in the main accounts and leverage the security APIs as needed.
For me I really like serverless when I'm trying to build a proof of concept or demo for my personal projects. A lot of the services are on the free tier so I've built many APIs with user auth, websockets, and ton of other features for nothing in price.