I call bullshit on the guy(s) who says he just wants the girls to learn English for their sake. He's self-rationalizing his own inability to learn a 2nd language. If you really want to help someone learn your language, the best way to teach them is to learn a bit of theirs. Imagine trying to learn a new language picking up a book in say, German, with no English explanations, and being told oh you're too lazy to learn German. I venture to say those of us who can minimally converse in the girls' language are literally 100x more able to teach them proper English than the rest of you nativists, and doing way more to assimilate them. Not to mention that many of these girls basically have no free time. Also, think it through a little more: the more English they learn, the wider their market, and the higher their price, so you wont be able to afford them anymore. So now you're either paying more, or you're back to FOBs, and it's a moot point.
In the same vein, just stop with this "respect the culture of your new country" bullshit. You want them to respect our culture, then pay them the same fee an American would demand for the same job.