I only replace the bent grass divots when they are very deep, with soil attached and in the early Spring or Fall. I also put the sand mix around the divot to seal it off when I do replace them.
At Bighorn, in Palm Desert, members are required to pick up there divots and deposit them in the garbage canisters when they pass one, or leave them in their carts until the round is over. Sounds crazy, but it works. The caddies also pick them up as well as any that the other players missed.