Well, the real unbalance is not exhaustion: it is that the only people who do need guides are the people who can't afford to pay one.

So, don't worry about "wasting" the oldbies' time: many of them enjoy knowing something others don't.

To me, the future of PS is not in removing exhaustion, but in providing alternate options to training endurance, so that not everybody needs to be a fast runner to move from one point to another. But it still has to be costly, one way or another, otherwise where would the challenge be?