Power Limitations with no point value

[onetrikpony]

Is it correct or fair for a GM to apply a limitation to a power when it doesn't return any point savings?

For example;
"Accessibility; Not During Full Moon" -10% applied to a trait or power that has a base cost < 10CP.

The rounding rule means that the limitation, which can be tactically significant to the character, and may be necessary to the setting, may cost the character that Perk, Easy skill or Technique.