Vicious49
Legend
It could also be the ugly paint scheme. Never underestimate the aesthetics when it comes to people choosing a frame. When I chose my very 1st frame back in the early 90s I walked in to a big sports store knowing nothing about racquets and chose what I thought was a pretty frame at the time.I've only ever seen one Head Extreme in the wild.
It should be more popular given Berrettini is the face of the line.
Perhaps he's too handsome and it intimidates buyers?