SpamFilters, etc : I don't see the point!

[InfoXp]

Hi happy users of PowerMail!
Could someone explain to me the REAL interest of filtering spam?
I get my usual load of garbage, say between 10 to 100/day, but it's so
easy to delete it that I don't see the interest to automatically do it.
And, of course, I don't worry about real messages that could have been
killed by a spam sniper in my system.
All the best - X(p)