I have been posting on Ab for quite some time now,and I think stoofur has a very valid point.
On "OLD" AB you always got an email to notify you on a new reply to your question,granted sometimes (with many replies) that could be a little bit of a nuisance;but better that than no emails!
I have noticed since "NEW" AB was instituted I get very few "Thank You's" or even a reply added to the original question/answer.
It's one of these things that AB keeps promising to fix but never does,and then goes on to fiddle with things that don't need fiddling with,and offer things we don't want/need,like Twitter!