Do you avoid replying to all when you are only Bcc'ed?
If you receive email via BCC, other recipients are not aware that you were sent a copy so it's actually a VERY BAD idea to Reply All in this case. It's ok to reply to the message you were BCCed on, but it's not ok to send your reply to the people on TO or CC list. Only the sender should receive replies from BCCed people.
9 times out of 10, you will find that your motivation for using BCC is something less than fully candid... and it's almost always better to use CC or forward instead.