The bigger gulf islands do have full services the smaller ones generally do not have even a basic infrastructure except for a dock and gravel roads if your lucky
Vancouver island itself has power from one end to the other but not the width of the island most people stay within reach of it I do not care about power so can buy a lot where about no one else would (few) and be happy with it
A bonus is land without hope of services is cheap land and I don't care if I have them or not. IF I had them would still use Solar predominately