Possible Clues:

• Showing unhealthy interest in higher-sounding offer
• Displaying an unhealthy interest in death
• Sickly, unwholesome
• Higher price offered, we hear, showing unhealthy interest
• Showing unhealthy interest in death
• Like black humor
• It sounds as if a higher offer has been made for what is so gruesome
• Preoccupied with gloomy or unpleasant things
• Preoccupied with gloomy things
• Like fascination with the dark side