True, but it's usually pretty easy to tell if someone just isn't good with english and is interested in buying, and the typical "nigerian scammer".
I sell a lot of watersports equipment through ebay for work. Most of it is not sold outside north america, so I get a LOT of international buyers since ebay is really the only way they can get this stuff. Most of the time it's sub-$100 items which doesn't attract scammers, and I've had dozens of no-hassle transactions with people who send me oddly worded messages. I'm sure if I send a message in spanish I could "get the point across", but someone who was fluent would definitely tell it was from a "second language" speaker.
However I have listed a few boats, and it seems without fail I get at least one bidder trying to scam. They almost always have low or zero feedback accounts, and always ask some totally stupid question about the item i.e "what color is it" when there's 20 pictures of it. Usually I just disregard such emails, but one time I "engaged" them I got a similar "argument with a fool".
I love it when people think their superb google-using ability trumps the fact that you actually own something and have years of experience with it. Nope, google turned up some site where someone posted a comment saying the vmax has 100hp, which these dolts instantly take as 100% holy gospel, never once considering the fact that anybody can post anything on the internet.