When you need to scale up and don't want that $160 to increase 10x to handle the additional load the numbers start making more sense: 3 month's worth of the projected increase upfront is around 4.3k, which is good money for a few days' work for the setup/migration and remains a good deal for you since you break even after 3 months and keep on pocketing the savings indefinitely from that point on.
Of course, my comment wasn't aimed at those who successfully keep their cloud bill in the low 3-figures, but the majority of companies with a 5-figure bill and multiple "infrastructure" people on payroll futzing around with YAML files. Even half the achieved savings should be enough incentive for those guys to learn something new.
> few days' work
But initial setup is maybe 10% of the story. The day 2 operations of monitoring, backups, scaling, and failover still needs to happen, and it still requires expertise.
If you bring that expertise in house, it costs much more than 10x ($3/day -> $30/day = $10,950/year).
If you get the expertise from experts who are juggling you along with a lot of other clients, you get something like PlanetScale or CrunchyData, which are also significantly more expensive.