A big advantage is if you live in an area that does not have a glider club, but want to go soaring. You can takeoff and climb without needing tow plane and lots of help, turn off the engine, feather the prop, and sniff out thermals. If you are club oriented and a club is nearby, you need to contribute your time while others are getting their rides. Not uncommon for people to go to the field, and work all day, in hot weather, for one tow and flight. I have a Scheibe SF-28A tandem style motor glider, and its for sale. PM if interested.