I'm as lazy as the next character, but anybody who can't find the energy to spell out "you," "why," "be," or "two/to/too" is far too lazy.
Really, nothing tells the world one's lack of education more than how badly a person spells. Text shortcuts just scream "HEY WORLD! I'M DANG STUPID! h'yuck!"
I understand the need on cellphones, but this forum is not via cellphone.