We see an ROI on the solution. If we didn't use NGINX, the app teams and developers would have to find more resources for development. If we didn't have a layer that handled the transactions into Rancher, the developers would have to redo their API calls and increase development costs.

I have 100% seen a return on investment with NGINX Plus.

The return on investment for NGINX Plus depends on factors like cost and management ease. Compared to hardware load balancers, NGINX Plus can be pricier, but it offers flexibility and scalability. However, other hardware load balancers like Array may have lower upfront costs and easier setup.

I have definitely seen ROI with NGINX Plus.

There was an ROI. It's a very useful solution.

The tool helps us to improve our website speed. 

I do not know about this.

Who calculates "ROI" for every single component of a large system with more than 100 components in it? 

The whole system brought ROI even better than what was expected.