Should Salespeople Be Eligible For Annual Salary Increases?

The Situation
In many companies, employees are eligible for annual salary increases based on performance and tenure. However, when it comes to salespeople, executives have two schools of thought.
Some argue that salespeople have the ability to earn as much as they want through commissions and do not offer salary increases
Other executives offer salespeople merit-based raises just as they do other employees.
Your Challenge
Should salespeople be eligible for annual salary increases just like other employees? Why / why not?