See How API Keys Work. It's six years old, but a leading API developer said:
... If you can demonstrate a need for a higher request quota, contact us.
However, the Key limit should be sufficient for development, so please only request an increased quota when your application is live and has a non-trivial number of users.
(Emphasis and contact link added)
Update: At least one app (SmokeDetector) has done this. Earning a quota limit over 10K.
Meanwhile, you state that your app "store(s) and serve(s) up questions/answers related to our products." It is difficult to see how this would need so much quota.
- You can get every question asked each day on Stack Overflow with only 78 API calls‡.
- Polling every 10 minutes only takes 144 API calls.
- A certain app theoretically scans every single post on all
Stack Exchange sites (not all through the API though) and it only
uses up to about 9K API calls per day.
Intelligent: caching, API filters, and use of the "Last activity" tools can really cut down on the need for API calls and allow more frequent polling of "hot" questions and answers.
‡ There are currently 7.8K questions asked each day, at 100 questions returned per API call (
pagesize set to max of 100). Use something like the
/questions route with
fromdate set to the last 24 hours.