Detroit would have two A10 opponents for whom bus trips were available (Cleveland State and St. Bonaventure) and only one in the MAAC (Canisius).
On top of that, there is the fact that Cleveland State and Detroit both play in the same conference (Horizon) in most other sports, so there's a possibility that both may consider it advisable to play in the same conference for lacrosse as well.
Meanwhile, lacrosse conferences seem to go in the opposite direction from football conferences. Most want to stay as small as possible without jeopardizing AQ status. In that regard, 6-7 seems to be the ideal number of members for most of them. I think that might be a disincentive to the MAAC adding Cleveland State, even though Cleveland State's coach has said that he considers conference membership crucial to the program's long-term success.