I have seen worse. The thing is, they don't do proof reading. They make build a website real quick. Not one but 10 to 20 of those sites of different themes/service/features at once and then tries to scam unsuspecting users. As far as I know people even sell those programming  codes and designs so that others can also set up their own scam websites.
If you visit a website, find it fishy and see a lot of language errors, then either they aren't native speaker of those site or they are bland scammers.
Those "top notch" scammers that you are talking about still exists. Probably earning peoples trust before screwing them up.