I think what most people have a problem with is that every single one of Maui's posts are self-promotional, or a follow up to a self-promotional post.
A quick look through his posts shows that as far as I can tell, he has not participated in any thread on "what airplane to buy", "how do I fly this instrument approach", "what are the rules on X", or any other topic other than about things he's selling.
This board is supposed to be a community of pilots discussing topics of mutual interest, and that doesn't contribute to being considered part of the community. It's like the difference between a neighbor telling you about this great security system they just got, versus a door to door salesman trying to sell you the same model. Same product, different treatment.
I think if Maui had instead come here, introduced himself, joined in other discussions, and been part of the community, his posts about AOA would have been better received.