Simple, they don't at some point they have off days (it human to have them)
An off day for a W/G may still be rated as positive to one punter but not to another.
Its all about how a punter perceives the experience and we only know. If some one feed backs about it (or it happens to you and your sharing that).
Over time punters look for and may be expect different things from a punt.
In hindsight some of earlier my punts could have been better. If I were, to have the same punt again, would I have rated the same
I know if I return to a W/G and I didn't like, things about the punt I may not (and have not) returned to them again.