The first and foremost reason

Metal Printing Cost is HIGH!!!

Here we are only going to compare with the most commonly applied 3D metal printing tech, just a short and easy way to see how huge the difference is, why we are able to save the cost and bring out a brand like this.

DMLS/SLM - $2 to $5 per gram

DMLS (Direct Metal Laser Sintering) and SLM (Selective Laser Melting) are two very similar powder bed fusion (PBF) technologies. Each technique melts a specified pattern of metal powder using laser beams. By repeating this process in successive layers, the machines build up complex parts, often using advanced metal alloys

Depends on quantity, complexity and size, price might go up more, this cost doesn't include post process such as polishing and passivation for anti-corrosion