Bob as another said - better to have it and not need it than need it and not have it - this is a rule that is most commonly applied to a big industry "elsewhere." I carry my polymer ballast with me in case of an unfriendly landout location in my motorglider. The added benefit is I can go for a flight when no one is home at the club. Or when the towplane is down.
If you don't want to fly at all - unless it's in a pure sailplane, which I can get - maybe one day humor me and let's go have fun man! No tow pilot required, but it is desired. I'll even give you a headset and pay for the Greta 2 stroke oil and evil, evil gasoline.
I really want to thank you for helping convince me to buy a motorglider!

See you at the club man! I hope you get some more flights in soon. I guess it'll take a tow pilot to make that happen? Or will you cave and go for a flight with me? No photos will be taken for Seminole Lake to see. I promise.. shhhhh