Don't ask high-rep users if they're sure they want to answer their own question

Whether this suggestion is going to be approved or not, here's a user script which implements the feature (derived from the source code of an own question):

// ==UserScript==
// @name       Yes I am sure to answer my own question!
// @namespace  Rob W
// @match      https://meta.stackexchange.com/questions/*
// ==/UserScript==

$("#show-editor-button input").unbind('click').click(function () {
    $("#show-editor-button").hide();
    $("#post-form").removeClass("dno");
    StackExchange.editor.finallyInit();
});

Add additional @match rules if you want to add the feature to more sites (full list of @match rules).

Chrome version

In Google chrome, user scripts are converted to Content scripts, which cannot access the page's non-DOM methods directly. To get it to work, use this method:

// ==UserScript==
// @name       Yes I am sure to answer my own question (Chrome version)!
// @namespace  Rob W
// @match      https://meta.stackexchange.com/questions/*
// ==/UserScript==

var script = document.createElement('script');
script.textContent = '(' + function() {    
    $("#show-editor-button input").unbind('click').click(function() {
        $("#show-editor-button").hide();
        $("#post-form").removeClass("dno");
        StackExchange.editor.finallyInit();
    });
} + ')();';
(document.head||document.documentElement).appendChild(script);
script.parentNode.removeChild(script);

Personally, if I have resorted to answering my own question, that means either

1. There are no answers
2. None of the present answers are sufficient.

In either of those cases, "Answer your own question" is the only real option.

It is impossible for an experienced user to mistake the "answer your own" button for the "add a comment" button. This means that the alert does not deter unwanted behavior (as this cannot be mistaken by an experienced user and answering one's own question is the desired behavior in these cases), and it does make the desired behavior more difficult.