If you care about silly things like your flights not being cancelled, operating on time, not diverting for MX, etc, then don't fly G4. Don't fly them either if you care about FF benefits, food service, baggage, etc.

BLI is not a major airport. It is currently only served by AS, QX for AS, G4, and very little San Juan Airlines (which I am not sure has a code). If you do a significant amount of flying, you will no doubt find yourself utilizing SEA & YVR from time-to-time; there are shuttle buses to both.