Disconnecting antennas when "not is service" by unhooking them makes little sense. As you stated, you're putting wear and tear on a connector that was never intended to be used that way. I use Alpha Delta coax switches that connect the unused ports to ground when not in use, along with a proper protection on the coax and rotor lines coming in the shack - ICE and Polyphaser devices bonded to a well designed ground system. If you have overhead power distribution, do you unplug every appliance, TV, stereo, computer, etc. etc., when not in use? Those wires feeding your house are longer than any antenna you're going to put up.