I'm not sure I understand your analogy but anyway, I don't need to buy a DVR with IR lights to know they are of no practical use for this application, I have had many dashcams with and without the lights for testing and I know the results already
From the users perspective it is I would think an almost unanimous vote that IR lights offer no real world benefit, in fact most would agree that they are a negative, an otherwise decent camera may be something that buyers won't look at purely because it has IR lights, many comments in this forum support that
perhaps you can add a poll to see how many people think IR lights are good, and how many think they are bad, do some market research and see what buyers think, not what designers think, you might be surprised