SC numbers for suited connectors

[Shandrax]

Some of the more "systematic" players might have noticed that both, the Sklansky II System and the Kill Phil System recommend to make moves with suited connectors. The big question is why, especially if suited connectors don't have that much showdown value as SC numbers seem to indicate.

One could argue that making moves with these hands is some sort of semi-bluff. Another explanation could be the that suited connectors have the best chance to crack overpairs.

Usually I like to know what I am doing and why I am doing. Suited connectors still leave me wondering...