alosso: To their benefit, 100 strokes of effect are 250 cr, while a heart ball is about 90 cr for at least 100 strokes. And, you need a ball in addition to the effect, and the effect might use up on the green, too(?)
Just confirmed it with the new gift of "country colours effect": These nice black-red-gold trails are counted on the green, too, while putts with much cheaper (vapour) balls aren't counted against their usability.
Happy greed, despite the extra of sprinkling stars on the putts!