what could be a good idea

[ben996]

i was just thinking and i thought this could be a good idea to add, feel free to express your opinion of it,
each blu ray comes with a sheet inside with a code, you put the code into a website and it tallys how many codes you have put in, after you put in a certain amount, e.g 20, you get a voucher code for a certain amount off your next blu ray buy, e.g £10, or a free blu ray up to £10,

what do you think, it will increase sales becuase people will buy blu rays if they know that after a certain amount they are getting a free one