Reasonable Addbacks

On occasion, we have heard from prospective buyers that there are too many addbacks being claimed on some deals. What are your key considerations in determining the reasonableness of addbacks when evaluating a company's financial performance, and how do you ensure these adjustments accurately represent the company's operational efficiency and earnings potential? In your process, do you apply a standard percentage of revenue as a benchmark for acceptable addbacks, or do you use another method? In one deal 70% of the addback was market adjustment for owner's salary, they paid themselves well!