I have been reading this discussion and I feel I have to weigh in on johnny's side. Collusion does happen, but means very little.
At D3 and D2, collusion doesn't mean much because there are so many more possible players and player growth means so much more that in the long run - after 4 seasons - the effects are minimal. It may make the coaches involved pat each other on the back and get a good laugh, but it means little.
At D1AA, if you have a mediocre team, you can only vision mid tier players which the better D1AA teams don't want. This tier has an abundance of players, and who is at the top of your vision may be at the bottom of someone else's. Easy to find an alternative, undecided and move on. Game play at this level doesn't rely as much on recruiting as it does scheduling to get your win # up.
At top level D1AA, you spend so much time figuring out how to get in between the cracks to battle for players the D1A schools don't want. Any 'sharing' with rival D1AA schools may save you some $$, but will rob you of part of the precious few available. Timing can also provide cross-country recruiting options that any collusion would be worthless for. At this level of D1AA, it is possible to communicate with a local D1A school to see who they don't want to save battles against them (since they would usually win). This could be called collusion, but only if there would be an agreement for the D1A coach to only tell their intentions to one D1AA coach and not others. Asking, without agrements to exclude others, would simply be for infomation on recruiting and available to all teams if they wished. Then it would be up to the D1A coach how to respond. A fine line - possibly - but no advantage gained over another team by deception. Again, this would ultimately mean very little to the outcome of each teams recruiting.
At D1A, with all top players being targeted by SIMS from the get-go, and potentially massive amounts to be spent on battles, identifying targets early and not expending any extra $$$ on players that would not be equally challenged would be important. Proximity of schools to recruits play a larger role in who to recruit at this level. Finding the level of recruit based on elite, BCS or mid-major status can also determine which battles you will initiate. Collusion at this level could eliminate some battles. Having SIMs on close schools for competition of recruits can be a great advantage, so then would collusive allies. In my experience, the ability to recruit a quality class is more dependent on how many quality recruits show up in your 180/360 from the WIS distribution, than your ability to recruit. ALL D1A schools are at the mercy of the WIS distribution. When I was at BCS Stanford, if a top 10 recruit was within 180 miles of elite USC it was 80% theirs from the jump. Ask someone at UCLA in the same conference, if collusion with Cal or Stanford or the Arizona schools would have changed their ability to get top 10 teams from USC. Probably not. Collusion between elite schools, doesn't give them that much of advantage because the game has a built in advantage for them. The only advantage they get is they can recruit and be done by signing and not battle much. BSC teams and then mid-major teams see the same built in advantages and top down feeding frenzy, looking for the recruits in the cracks of those not wanted by the elites.
A long winded explanation, but all in all, collusion can happen, but in the long term of many seasons it has a small impact on the outcomes of games, seasons and teams.