lease option

[Juliet Banks]

when a tenant buyer comes along and say give you a $10,000 deposit for a property that you're lease optioning to them, what happens to the deposit, some people say it is yours it is nonrefundable,  but does'nt the end buyer expect that to be deducted from the sale price, and if so how do i make money, do i only hope the person does not buy the propperty so that i can keep the deposit,  how does it work, can someone please explain?