WIN Premier League Match Tickets when you Withdraw money On Barclays Cash Machine

When we withdrawn money by using a cash machine, it always ask if you want to keep the advice slip...etc. I guess from the environment point of view, most of the people, do not keep this. E.g. it is just an approve that you have withdrawn certain a amount of money by using that bank...[if something goes wrong with your account balance in this transaction, you can use it as a proof, which mean the cash machine may have some problem] etc.

Do you realise that when you withdrawn money by using a Barclays cash machine. It will ask you if you would like to get the slip, you can win a pair of Barclays Premier League match tickets?

In my optional, I do not think this is a good idea to put a message like that on the cash machine.
"Would you like an advice slip with your cash? If yes, please check the reverse for your chance to WIN a pair of Barclays Premier League match tickets"
This would encourage people to print more advice slip. E.g. Some people may think if they withdraw more and get more advide slip, the chance of winning a Premier League match tickets will be much higher. Instead of withdrawing certain amount of money at a time, they may split the amount into small trunk so that they can receive more slip for the lucky draw...

I think it would be better to say
"Would you like an advice slip with your cash? If NO, please check the reverse for your chance to WIN a pair of Barclays Premier League match tickets"
Then it will email/post you the ticket togther with your bank statement...etc.
To be freindly with the environment, it is better not to receive the advice slip, if you do not need to. It would save some paper/ink, electric to print the slip, time to maintenace the parts which is use to print the slip and refill the paper for the slip...etc. i guess it would save the bank lots of money.

That is the advice slip I received:

After you have the advice slip, you can then follow the instruction at the back of the slip and enter the code to the Barclays website. http://www.barclays.co.uk.ticketoffice. You will know the result instantly.

Shall I say Good Luck!!! or Be friend to the earth?