Why do grooves matter?
The grooves are the sole contact point between your ball and the club, imparting backspin to help lift the ball into the air. R&D testing has revealed that after 125 rounds, wedges spin 2,000rpm less than wedges with new grooves and consequently roll 14 feet further on landing - which is huge.
What causes wear?
All grooves will wear slowly over time due to a number of factors, including gradual wear from play, but golf's equipment manufacturers work hard to limit this.