That being said, Matt Cutts, Google's head of search spam, published a video yesterday telling webmasters who leave comments to "worry about" two types of comments: (1) Using keyword rich anchor text or your company name, as opposed to your real personal name when commenting. (2) Using commenting as your primary link building strategy. If you are doing these, then Google may consider it a link scheme and may take action. Article source: http://www.seroundtable.com/google-blog-comment-names-17674.html
for any reason, maybe like what you have told, some member name here also use their keyword, company and domain name are they will get a pinalty? Lol