The reward on a post depends on a number of factors but the most important ones are:
1-It is not the amount of accounts that are voting.
2-It's the voting power (AKA Steem Power) behind the votes.
3-The median market price of the Steem Token.
In esence having more Steem Power equates to having more votes at your disposal.
Thank you @onthewayout - that's helpful and explains (right) why people like Stan and Michael and others with lots of Steem voting have pushed the $ for Matt's post right up.