Provide option to add equipment to a personal "wish list" for future purchase. Helpful for locked clubs that become available at higher levels. Allow player to add any club to wish list, then offer to purchase or upgrade (replace) club when it is unlocked during play. Allows player to shop the pro shop, mark desired clubs, and remind player to purchase them as soon as they are available.
I spend time looking through clubs I'll be able to get someday, then have to go back and research all over when I forget what club it was...
Bonus: since club inventory is growing/changing, providing a wish list enables a "you might also like..." suggestion feature. Sell more gear!