If you such messages then it means that eBay has rejected your offer due to your account password being too easy.
What should I do, so that the Sniper can bid for me?
- Sign in to your eBay account andchange your password to a more difficult one
http://signin.ebay.pl/ws/eBayISAPI.dll?ChangePasswordAndCreateHint
eBay strongly suggests that your password SHOULDN’T INCLUDE :- common dictionary words
- names
- simple dates
phrases that are similar to your login..
- Sign in to your PerfectSniper.com account and change your eBay account password
http://www.snajper.net/accounts.php
After completing these steps, the Sniper should be able to successfully bid for you.