If you have a number of sites interlinked for SEO purposes, I would recommend using different Google Sitemaps accounts (now part of Google Webmaster Tools) for each site for this very reason and this is what I do. However, if you believe the Google ‘Don’t be Evil’ mantra and consider the fact that there may be legitimate reasons why someone may manage several sites through a single sitemaps account (like a search agency managing different client sites), then I think it is highly unlikely Google will penalize you. So I think your personal site should benefit from this arrangement provided the link context is right - remember the link anchor text, body copy and page <title> of the referring page should refer to the topic of the destination URL for you to get the most benefit.