https://www.netlify.com/blog/2015/03/06/comparing-netlify-an...
You're completely forgetting Continuous deployment in your comparison, which is a pretty big part of the modern static workflow. This includes things like pushing branches to different URLs, having a way to previewing pull requests, caching dependencies between runs, etc, etc... It's a huge part of our service.
Apart from that, if you ever work with static publishing and a CDN, and actually tried making the CDN cache your HTML assets, you'll instantly run into problems with instant cache invalidation and atomic deploys. You'll never run into these issues with netlify.
Rollbacks are possible with git, but previewing any version you've any deployed at any time are not something you can do.
Even basic things, like getting both your naked domain and the wwww domain to work correctly will often take developer time on that platform (how much do you bill your time at? Hopefully more than $49/month).
As for cost - our free plan is super generous and cover pretty much every thing you'll get with the alternative setup you mention. And for personal projects or open source projects we even give away our Pro plan for free!
The people that pay for our plans are typically not developers but their clients or employers who care about the best performance, highest uptime, and fastest speed of development.