For every person that signs up with your referral, they get one entry and you get one more entry. Unless they're willing to try and fail to contact loads of fake details in quick succession. Even if they do intend to pay out on this campaign, they're very unlikely to ultimately pay out if the first few 'winners' are fake entries, and then your effective chances of winning actually goes down when people use your code with fake details.

So, signing up with fake deets may be a statistically bad choice.