AIM is not for everyone. I demonstrated AIM to my friend, and he chose the Fidelity managed accounts anyway. He prefers not having to deal with placing orders and managing a spreadsheet, even though he understands his returns would likely improve. He's happy with his current investments managed by Fidelity.
Also, some AIM users might prefer to manage only part of their investment portfolio using AIM. I prefer using 2x and 3x leveraged ETFs with AIM. Many AIMers wouldn't touch those.
Personally, I enjoy using my spreadsheet and having AIM trades execute using the preemptive approach with limit orders placed for next trades. Different strokes for different folks.
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