They will use you for all you're worth and then, no matter how they've benefited from you being amazing at your job, will find any excuse to ruin your life (even if they have to make one up).
They make up the criteria for evaluating your performance on the fly; sometimes even creating criteria that directly contradict instructions received in mandatory sales training classes. Employees are forced to choose between: adhere to these arbitrary, contradictory criteria regardless of how they affect customers' experience or the employee's earning potential or not adhere to them and receive low call scores and negative performance evaluations.
Management cannot be bothered to create reasonable call scoring and incentive systems or assist with difficult/abusive customers. In fact, they put the newest person on the team (me) in charge of creating a system for the employees to score/evaluate our own calls (effectively doing management's job for them); then took credit for the design, synthesis, implementation and benefits of that system.
If you ask a question they can't answer or share an opinion/fact they don't like, suddenly you have a "poor attitude" and get fired.
Earning potential through commission and monthly incentives
No job security or consistency in performance evaluation criteria; stressful, predatory work environment