Every morning, before I do anything else, I check out all the bloggers on my blogroll and read their latest posts if they look interesting. Often I will leave a comment. But I'm telling you, if you do not have a "notify me of any comments" or "Subscribe by email" facility on your posts then there's no need to reply to my comment because I won't read it. I simply cannot remember all the comments I leave each day and I need the email reminder.
You may have originally enabled the email option on your blog, but Blogger has recently revamped its format and you may need to adjust your settings to get the follow up facility back on line. Check out my post CALLING ALL BLOGGERS for more details.