While your Sim doesn't make as much money in their profession when they are Entitled, receiving an allowance via the Messenger Post is an option. They also get along well with other Sims that have the same trait or with other Tredonian nobles. However, Sims without these traits are not as compatible, and your Sim's relationships with them develop more slowly.
This article relating to The Sims Medieval is a stub. You can help The Sims Wiki by expanding it.