I've see something similar when offering items on freecycle: people seem to think that the more they insert "pls" and "thnx" into a message the more likely it is that they'll be first in the queue.

I swear at least once there was more instances of "pls" and thnx" (there seems to be a significant overlap between people who overuse the words and people who don't bother to type them properly, though that may be the linguistic snob in me talking) than all other words combined. It backfired by making the message difficult to read so I binned it and read the next.