Well, you won't win for a start!
The site relies on users visiting the site to pay for the prize funds, so if you do not log into your account for a certain period of time then it will become dormant.
This means your entry into the draws is removed. (If someone else has signed up with the same postcode it still could be drawn - just your own personal entry is removed.
You will not be eligible to claim a prize if your account is dormant. This keeps the site fair to those who check every day!