A good thesis statement on revenge and the price of revenge should delve into the intricate aspects of these actions. It should parse the conditions that propel people to seek vengeance and measure the consequences (the price) of their vengeful behavior. To avoid speaking in generalities, one should probably locate specific examples of revenge and its price. To do so, they can use a poem, a novel, a movie, a TV show, or so on.
For a novel that might produce an insightful thesis on revenge and its price, consider choosing a novel by one of the Brontë sisters. Charlotte Brontë’s novel Jane Eyre has multiple instances of revenge. One could argue Bertha Mason gets revenge on Edward Rochester for locking her up, when she burns down his house. Alternately, one might argue that Jane gets revenge, via Bertha, on Rochester for concealing his prior marriage to Bertha.
Wuthering Heights, by Emily Brontë, would also be a good novel to discuss in relationship to revenge. One could build a thesis around Heathcliff and discuss how the price Heathcliff pays for his revenge is a type of interminable torment.
For a TV show with ties to revenge, take a look at The Sopranos. Tony Soprano, the mob boss and antihero, regularly seeks vengeance against those who go against him. Here, one might want to talk about how the price of Tony's revenge relates to his physical and mental well-being.
Finally, for a film about revenge, maybe check out the movie adaptation of Gone Girl. Discuss how Amy possibly distorted the consequences of her husband's behavior in order to justify her elaborate revenge scheme against him.