At logicandlanguage.net the author talks a little bit about comments on weblogs. On why one might allow them, or do without them. As you can see, I leave comments open here. (Behind the scenes there is a hardworking comment spam filter. Without that, this place would be deluged with spam.)
I can understand why one would want the place to yourself and do without comments. However, if you do, and if you want your readers to email you (as the author of logicandlanguage.net does) then please let the reader know your email address.