There's good reasons no one uses seacoms. Usually I only see them for things like magian, and indicating lotting. Or leaving moronic messages like "Kitty meow meow time now!". Hardly any NA ever use them and heres why.

-They're passive. Once you set one it remains and it could be old, you send someone a tell and they say like "oh yeah I was looking but now Im in an ls event" etc.
-You can only set one purpose with limited description. But there can be any number of things you might be interested in doing.
-They reset after you logout or D/C. It's Annoying to have to restate your seacom every time you reenter thee game.
-Most people particularly NA don't ever use them anyways.