We haven't invested any money into the solution and therefore haven't looked into ROI.

The benefit of achieving asynchronous processing. This gives you:

• Number one is the comfort of your system being stable and running in a very reliable way. Therefore, you'll have very minimal downtimes, which means more revenue for you.
• If you're able to set it up correctly on-prem, then it actually becomes a one-time cost, actually, installation. So you don't need to pay for it ongoing. That means your revenues even become higher. 
• But if you lack the technical capacity, you can purchase a managed instance from Microsoft, AWS, GCP –  cloud-managed. By the time you're going to those platforms, I think you have enough revenue to pay for the cost. But you will also get a very higher rate of uptime.

They gave a really good deal and we have been with them for five years even though the product got bought over by couple of different companies.

I didn't have any visibility on the pricing and licensing. But I can say that, we needed product like Greenplum to store, manage and analyze huge volumes of data which can be daunting task

Not within my area I’m afraid, but I understand that this was a very good fit from an ROI point of view

Good.

It's a good product when comparing the price to its functionalities.