Error of scale!
EDG_
Your argument is no different to closing a thread because a few are of topic.
Imagine if threads were closed just because most of the posters were off topic? The intent of the ATM is analogous to the OP for a thread. And it shouldn't be shut just because there are a few (quite a few) off topic posts/(ATM threads) as long as those constructivley engaged are aligned with the intent. Those threads that aren't tend to get closed. I have found my ATM experience quite positive. I find I can quickly decide whever an ATM is worthwhile by reading the OP.
One I started barely got a response. (Except for a couple who had their own agenda.) I see this as a good sign as it might have promise. Since then I have been revising my physics and maths as well as learning an unending lot of new theory because I want to see if i might be right. (i know this is doing things backwards and quite prone to error) I don't care if I am wrong that just means I will have learn't a lot once I realise that.

What I am saying is there are a lot of thinkers out there who are mathematically illiterate and will never be able to communicate in a formal way; but their ideas need to be heard. You just never know! (But you don't have to be the one to read it!)

These people if they feel they have a place will continue to foster scientific interest in the community via word of mouth and enthusiasm. If however, they are not allowed their contribution; then scientists might find themselves further down in the same bucket as teachers. Because the general populace does not have the maturity to drop the chip on their shoulder left there from their own school days.
(we must be cautious of percieved arrogance)
Politicians are often guilty of this. No if you expect the language of maths from every idea then try this.
Censorship+Chip on shoulder =No Funding!
There I have finally derived somthing!