Originally Posted by WiredGuy

Why not offer them a flat rate instead so you can keep the percentage over time. After the model makes $x in earnings, then the referrer gets a flat rate. Make it high so its appealing. For example, once the model makes $2000, then the referrer gets a flat rate of $200. Works out to about 10% of the first check instead of ongoing payments and makes accounting easier.

Works out better for you in the long run too since you keep that percentage over time.
WG