We do, If you look at the ranking for Shadow Pool it weights first by Shadow Rank then by Expiration date. We promise to limit our posts (only 3 the last week) to ensure everyone fairly can get posts AND in your settings you can limit ALL users to 15 up votes per week from your account!
"How does ShadowBot decide what to vote on?
ShadowBot works on a pool mentality. Every Shadow Caster is given a position in the Shadow Pool prioritized by their Shadow Rank. Authoring high value posts will increase your Shadow Rank leading you to see more of your posts receiving priority in the Shadow Pool."
https://shadowbot.us/shadowbot/faq.php