Imagine that the employer does not have a non-compete in place with her current employees. In the US, she may offer a single, token amount in exchange for signing an agreement containing a non-compete clause. This could, for example, be described by the employer as a "bonus". It does not have to be reasonably-based on the amounts the employee might gain from working for a competitor. It could be much lower. The employer could make signing the agreement a prerequisite to continued employment. Arguably the purpose of such a "bonus" is primarily to protect the employer against challenges to the enforceability of the agreement, not as an incentive or reward to current employees.