Heh... back in the days of Messenger Plus 2.6
they had like a few commands which sent text and once someone with msgplus recieved it, it would play a sound ("Heyaa...", "Mwahahahha" etc) and they had no purpose at all (they have now evolved into the popular soundclips), but they were the reason I got plus in the first place.
Not everyone is looking for good useful features.
Some people are just looking for a bit of entertainment while using messenger