This is Firefox GreaseMonkey script, kill articles posted by f*cking gyosha.

kill_gyosha.user.js

// ==UserScript==
// @name           kill_gyosha
// @namespace      arcadia
// @description    Kill articles posted by gyosha.
// @include        http://www.mai-net.net/bbs/*
// @include        http://mai-net.ath.cx/bbs/*
// ==/UserScript==

(function() {
  // 業者が増えたらここをカスタマイズしてください
  var GYOSHA_KEYWORDS = ['\\d+bag', 'bag\\d+', '竹村光一', '北川景子', '販売', '財布', '偽物ブランド', 'コピー商品'];

  if (!document.URL.indexOf('?act=list&') < 0)
    return;
  var is_sst = document.URL.indexOf('/sst.php?') >= 0;
  var re = new RegExp('(?:'+GYOSHA_KEYWORDS.join(')|(?:')+')');
  var trs = document.getElementsByClassName('bgc');
  var cnt = 0;
  for (var i = trs.length - 1; i >= 0; --i) {
    var tr = trs[i];
    if (tr.tagName != 'TR')
      continue;
    if (tr.textContent.match(re)) {
      cnt++;
      GM_log(cnt + ' [' + tr.textContent + ']');
      if (i == 0 && is_sst) {
        var tds = tr.getElementsByTagName('td');
        for (var i = tds.length - 1; i >= 3; --i)
          tr.removeChild(tds[i]);
      } else {
        tr.parentNode.removeChild(tr);
      }
    }
  }
})();