It is a matter of self-awareness of what is the difference between having actual sales vs. getting subscription for free trials for new users.
It is really difficult for us to mitigate this even on our end as we have no control of when and when they don't want to rate a campaign as "Got Sales" as this can be subjective to the buyers' decision.
As much as possible we want all the ratings of seller profiles accurate and seamless, however, again, this depends on the buyers as most of them leave such ratings as courtesy to their sellers given that there was no manipulation involved from the sellers which we strictly do not allow in any case.
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The Got Sales Rating is a contentious one because it easily be misleading.
The more accurate indicator to look at is repeat buys. The higher the percentage the more it means that people came back for a second round of traffic from a seller.
Which means that seller provides high quality traffic, because nobody will buy from someone twice if their traffic is not good.
Hope this helps
That's a good point Mogale. The repeat buyer percentage can really tell more truth if their traffic is converting to actual sales