The problem here is that revenue protection departments catch on to these things, and more quickly if you post about it, or operate a service that abuses or facilitates it.<p><a href="http://www.nytimes.com/2011/05/08/magazine/mag-08subversion-t.html" rel="nofollow">http://www.nytimes.com/2011/05/08/magazine/mag-08subversion-...</a><p>and more recently...<p><a href="http://www.aol.com/article/2014/12/31/united-airlines-suing-22-year-old-nyc-man-who-figured-out-how-to/21123067/" rel="nofollow">http://www.aol.com/article/2014/12/31/united-airlines-suing-...</a>