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down by 14...and then you score the TD and are down by 8. You should go for 2.
This one really isn't very easy to see which is why pretty much no teams out there do it.

I wouldn't be surprised if there was some high-school team out there who got it though since many of they coaches are also teachers at the school.
So put a fairly sharp math teacher in this position and maybe it happens. Throw in the fact that for many high-school teams the XP isn't going to be anywhere near 100%.
Speaking of which, to be fair I don't think they should be counted as 100% for NFL or NCAA calcs either. Also, it's a 2.5yd play that involves some added pressure for the offense because you only get one shot at it and there ain't a whole lot of field to work with or maneuver around.
I don't know what a team's success rate on 2-pt conversions is usually.

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There must be some research done on the EV of this somewhere??? There has to be a reason that at least some NFL coaches don't do this.

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The reason is probably that most of them are ignorant. The one's that are aware are too old school and stubborn.