One of the biggest reason buyers don't make offers on homes is because they don't want to offend the sellers. It goes against human nature to offer substantially less than asking price. It can be insulting to the seller and embarrassing for the buyer. Buyers also erroneously believe sellers know when their homes are overpriced, and if they were willing to sell for less, they simply would lower their prices. Maybe you should look into reducing your selling price in as much you will have some gain.
If you have a super hot lead on a very desirable property, something which a real estate developer could make a lot of money on (usually from deceased owners or an elderly person) in a very desirable location. Once the listing is locked down, immediately call their long-time buyer clients to get in and lock down the deal.