Place filtering power in the hands of the players!

[Cold_Raven]

For example, I could place in my filter the words/phrases: gold, .com, delivery.
I could then choose the options: tells, shouts.

This is a fantastic idea. All for it!

Problem is: g0ld, .co m, de livery, just bypassed your filters.

That's the beauty of the system... if something slips through, you can control it yourself and update it immediately.
No need to add things to your blacklist.
No need to wait for a patch or action from SE.

Even better... the Gil sellers have no idea what your personal filter settings are.

Right now, every Gil seller knows exactly what your filter settings are... because they're the same for everyone. They can test and verify and update their own systems immediately by checking against their own characters.
With this system... can't do that. Gil sellers would be "working in the dark."

Sounds to me like a great system to put in.
We all know that no other static system has ever stopped them. This is a dynamic system, controlled immediately by the user themselves.

Would it be perfect? Likely not. But come up with a perfect Gil-seller blocking system and Blizzard and SE will make you a rich man.
It does, however, contain many advantages to the user, and many disadvantages to the Gil seller.

All for it!!