Why I'm not using Runscope

//Why I'm not using https://www.runscope.com/

var Request = require('mongoose').model('Request', {req: {}, res: {}});

var reqBits = function(req){ return {}; }
var resBits = function(res){ return {}; }

module.exports = function(app){
  app.use(function(req, res, next){
    res.on('header', function(){
      if (res.disableLogger)
        return;
      Request.create({
        req: reqBits(req)
      , res: resBits(res)}
      , function(err, data){
      if (err) return;
          console.log(req.protocol + '://' +
                      req.host +
                      (req.port ? ':' + req.port : '') +
                      '/logger/' + data.id);
      });
    });
    next();
  });
  app.get('/logger/:id', function(req, res, next){
    Request.findOne({_id: req.params.id})
    .exec(function(err, request){
      res.render('request', {request: request});
    });
    res.disableLogger = true;
  });
}