It is a bit of a joke really. Sometime's it's SIMPLY not your fault and you get called a walkover which not only destroys your stats but taking points off as if you never contested the draw is a bit questionable. There's not much difference between telling a opponent you would rather lose 6-0, 6-0 than not even getting a scoreline AND losing ranking points. I don't think you see this in the real life tour so why would you here. I know people get lazy and mess up the draw by deliberately not wanting to play a match but when you're in the dying hours of the deadline and your OPPONENT won't even accept your friend request, it's pathetic.
BTW my previous and SOLE opponent has NEVER added me for my matches and i got the walkover last time and he got the walkover this time. Both times i tried adding him yet no reply. A bit off topic but that's an example.