There should under no circumstance, other than a deliberate exemption, be a situation in which skills that vary in overall power are allowed to cost the same amount of Memory to use.
If for no other reason, then simply because a single point of Memory available, should have a consistent value in terms of power the player is allowed to exert.
Do you think that Source skills should count for that deliberate exemption?
Because while Source skills are more powerful than other skills, they also have a more specific limitation for their power - needing to spend a Source point.
