It is an interesting idea, but your approach to pricing seems off: 100/day is not reasonable, at least not for small/medium teams. Trying to do arithmetic on run times and hourly rates to convince people it is reasonable is not only overly simplistic, but actively distracts from the conversation you really want to have - how does your solution solve their problem? People buy when they believe you can solve a problem…
100/day is not reasonable. If I'm understanding OP correctly then at that level this tool would be saving the customer's engineers 14 minutes of disruptive downtime 100 times per day. If that's correct then $100/day may indeed be unreasonable, but because it's way too low. I doubt the useful target market for a tool like this is in the $20/month or even $100/month category. What does a series A/B company that runs 10…
Running 100x test suites would be $0.90 to $4, in server costs.
Charging 25-100x the server costs is optimistic, at best.