How much film do these services get to watch on most kids? And how do the services know what they are looking at? A 60-second clip of a kid playing elite opponents will not be as useful as 60 from another kid playing against small private schools.
I imagine that it is like video dating services, you can't tell if she's the one or if she is a psycho, stalker chick with that nails-on-the-chalkboard laugh who is waiting to balloon up like her 300lb. mother did after her first child. (not speaking from personal experience...just sayin')
A good majority of the amount of film on a kid falls on the family of the player and the coaching staff the kid plays for.
Out of the teams in the SEC, I would have to say that the state of Louisiana may be the worst at getting film of their recruits out. They certainly haven't done a great job.
The smarter coaches at the bigger schools will have film archived for the kids they think have a chance at playing at the collegiate level.
FWIW, there is a growing industry now of people who videotape and highlight certain kids simply for recruiting purposes.