I agree with Mauricio above, we have dealt with a number of Dominicans via Corotos (selling stuff), and not one bad experience, quite to the contrary. The point that the buyer might buy something spontaneously, we've also seen. We sold an old A/C to a family, who saw that we also had a newish stove for sale. The took the A/C with them, returned in a couple of hours, and took the stove as well, with the price we asked.
Also, I think deleting English ads only makes sense, as Corotos is a Spanish-speaking site targeted to a Spanish-speaking population (the DR). I have seen sites with UGC (User Generated Content) outside of the country, where it is not only forbidden to post in foreign language, the site admins also advice against dealing with people posting in foreign language, for security/safety reasons.
From the two of us, my wife is more hesitant with letting prospective buyers enter the house, and with items that we cannot place in front of the house, we move close to the main door, so that the buyers have no reason to actually pass the door and close all the doors within the house. If you have a garage you can close, you can also place items for sale there, then the buyers don't even need to see into the house, and if it's a busy street, the item might sell even without an advertisement.