Yesterday my people reached was something above 520. Why is it at 493? (I am talking about my Arqade profile not Arqade meta)
According to the announcement for the 'people reached' stat:
... [It] counts views on the following:
- Non-deleted only
Answers - Views of the parent question for answers that are:
Score > 0 AND
Also meets one or more of the following criteria:
- In the top 3 answers OR
- Is the Accepted Answer OR
- Score at least 5 OR
- Has at least 20% of the total vote count
Your 'people reached' statistic must have gone down because one of your posts no longer meet the above criteria.
As a side note, you are currently at 526 people reached - so nothing may have happened at all.