I don't see any good in having a site defaced. It makes you look bad as an administrator (if you were doing your job it wouldn't have been defaced and istead of wasting time "undefacing" the site you could be patching the vulnerable software to keep you from getting defaced.) Also the extra traffic... what if your site does a lot of credit card transactions? If it's defaced then how are your customers gonna feel about trusting your company with private info in what is suppossed to be a secure environment? I am still just a kid and I understand that much.