well the number of walk overs is increasing,in real life tennis you only get a walk over when you're oponent gives up the match or anounces that he can't play
which is not the case in tennis elbow,i think maybe the players should try more harder to play their matches on time rather than winning(or loosing)the match by a w.o
moderators should think about it for 1 second and i'm sure they will find a sollution for this problem so that everyone is happy and justice is satisfied