It may or may not be a good idea; it's not for me to decide. I think the intent of the question was for cases where, because of an enemy rush of territory, your vbase is 50 miles or so from the nearest friendly airbase. It would be nice in some cases, to be able to refuel/rearm a fighter at that vbase to continue the defense of that base from the incoming hordes.
Think of it as a kind of forward airfield, perhaps with limited fuel/ammo (25-50 percent of what you originally had at your real airbase). And of course, if the ords and fuel are down - or maybe all the hangers - you get no refuel/rearm.