Slicing is not connected to any crafting skill. It is only used to make money, and to obtain augments.
Going by the Codex entry for Slicing, this statement is incorrect. It lists a benefit of giving schematics for Cybertech, as well as mission discoveries for all skills.
Recommended Crafting Skills: All (for mission discoveries), Cybertech (for tech schematics).
Not sure how rare those things are, but it is still something other than 'only used to make money'.