You can get away with not having them, it doesnt make or break the game, but it just finishs it off nicely.
If u played one with glow balls u would notice it, if u never played one with glow balls and only the std balls, u wouldnt miss the effect. The effect during blacklights, even with std silver balls is still very good.
It SOLD for only $1975. I am assuming someone bid alot less cause it was missing the balls. Someone saved a good $1500 at that price.
Room financially $ to even buy a set of glow balls off me.lol to finish it off nicely.