I don't want to click on YES because I have other non-standard balls available to me. 700 credits for a sleeve of balls just to complete the entered game can not be the answer to this problem.
You explanation that WGT is affiliated with USGA etcetera is not correct. According to you if a player uses a different kind of ball in play he or she will be disqualified. How is it then that WGT provides the player with the standard ball? In your reasoning i had to be disqualified.
That leads me to the deeper question to this problem. If WGT upgrades their game and provides us with this disqualification option then we need to see how much life there is left (number of shots left) in a non-standard ball before we enter a competition. A good and simpel fix would be to compare the numbers of shots left in the ball and the number of shots needed to complete the entered course at even par.
Conclusion:
If WGT continues to provide us with the most realistic golf game ever then there should be a simple fix to this. Or the player buys new balls of the same kind or he is disqualified and can not complete the game.
Providing the player with the standard balls is wrong in my opinion.