Three Greens Closed For Monday's Closed Practice Round!

Garry Smits reports that the TPC Sawgrass' 4th, 11th and 12th greens will be closed for Monday's Players Championship practice round, which is closed to the public as part of a PGA Tour Championship Management program to save operating costs. (Detailed earlier this year when Tuesday's were off limit at Riviera.)

While the closing of the greens is not surprising considering their fragile state, this seemed more surprising to me:

Players were not allowed early practice rounds on Saturday and Sunday, as has been the past custom for those who did not compete in the previous event or had missed the cut.

Seems a tad extreme, no? How much damage could 20 players do?