Saving $400/month covers about 3-5 hours of engineering time per month. In a year, call it 30-50 hours. Did this project take more than 30-50 person-hours?
(The obvious argument about how it might pay off more in the future are dependent on the startup surviving long enough for that future to arrive.)
(The obvious argument about how it might pay off more in the future are dependent on the startup surviving long enough for that future to arrive.)