Many radio amateurs scan DX clusters instead of bands. DX clusters are an easy and convenient way of finding rare DX. They also make HAMs deaf. Not all of them, but a small percentage of (very annoying) people. Relying on a DX cluster makes one lazy. You don’t have to listen anymore. At least, some think they don’t.
Listening is much more difficult than yelling into a microphone. Yet, listening is much, much more important than getting your signal into the air. Unfortunately, some just don’t get it. They spot something on a DX cluster, change to that frequency and start yelling immediately. They don’t listen. If they would first listen for a while, they would know that the station is working split, asks for specific prefixes or certain numbers in a prefix.
Take your time! Thanks to those DX clusters, there’s a monstrous pile up anyway! Your chances improve significantly when you take the time to listen. Just picking up the words “listening up five” makes the difference between a successful QSO and just being an annoying source of interference.