[zielwolf]

I agree with AdvantageEnglish: It's all a matter of supply and demand I think. In so many places the ESL market is totally unregulated and nothing more than a money making machine. Schools and institutions run by incompetent administrators who wouldn't know a TESOL qualification if it kicked them in the butt hire incompetent, unqualified teachers whose motivations for working in the ESL field may in fact have little or nothing to do with actually seeing students learn English. I know of cases in China where people have gotten jobs by cutting and photoshopping TESOL certificates they downloaded off the net! (Just search Google images for "TESOL certificate".)
As long as the market is so unregulated but so big, the lazy ass teacher will have a niche.