The black color has been a tradition for decades, mainly at the behest of onstage players. They believed black appeared more professional, while other colors such as silver, gold, red, etc... gave the keyboard the appearance of a toy that someone would give to their grandchildren for Christmas.

Fortunately, the plastic material that current arranger keyboards are constructed are high impact plastic, often stronger than steel and unlikely to undergo serious damage if inadvertently dropped on the floor. The main drawback with black is when performing outdoors in sunlight. It tends to get very hot, which could eventually lead to damage to some of the electronics. Silver, such as the PSR-3000, was a much better color for outdoor performers, as it did not absorb the sun's rays as readily. My S-950 got so hot that when playing in direct sunlight, you could not touch any of the keyboard's black surfaces because it would produce a nasty burn.

All the best,

Gary