Though people still use the acronyms in their ads, they're redundant now. With the new system the seller has to check boxes indicating whether they want to sell, want to trade, or both, before the system will allow the ad to be posted. This info in then reflected in both the list of ads and at the top of each ad, so there shouldn't be any confusion.Having looked at a lot of classifieds, there are many, many occurrences of people listing as WTS, being asked about trades, and then saying sure and listing interests.
Perhaps the site should be more explicit when posting by having an ‘interests’ box for those posting as WTS but with specific trade interest possibilities? @Joe Link