Bull ****
...you are so naive...

Why get excited? No insults were meant. Lets try to reason.

To quote you: "I can filter 99% of it out with the right
software.." Meaning that junk mail gets to your software and
then it is rejected. Whether or not your software bounces it
back (some email clients do) the spam generates bandwith.
Taking the precaution to not publish your email in the first
place prevents the bandwith abuse and helps all of us.