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They always seem to do that... My theory is that it's easier for them to bypass the spam filter...I reported one. It was a few letters and numbers. I think that was to test the waters before going full on.
Maybe, though these scammers are most likely ran by the same group of people, as they're advertising similar services and some of them have the same jibberish location and car...Nahh, I think those are just convenient keys grouped together on the keyboard. It looks like they create a thread and then come back and edit the threads later. Users are creating completely different user names and use different IP addresses each time.
Who knows, it could indeed be one person or an entire group of people but hopefully they bug off soon...It's probably just one person. They are posting english characters first as I think the spam filter is stopping chinese characters.