There could be many reasons. We send email notifications for all enquiries but some emails go to junk folders or are just not seen, or they may have unsubscribed from PLU emails. Some people don't visit the People Like Us site every day (as hard as that may be to believe!) and, in other cases, someone may have read the message but just decided not to respond just yet. Don't be discouraged. You can send a reminder after a while or just move on to the next home.