(I've thought about that, but the consideration that seemed more salient to me at the time was: If you send different signals than expected then those who can notice subtlety will notice a discrepancy given, say, a few hours of interaction. Yes you'll be oft-discounted (and you will have incurred this cost yourself and I don't deny that this is indeed a cost worth considering), but the people who falsely present themselves as more important than they are so vastly outweigh the people who falsely present themselves as less important than they are that causing someone to update their estimate of your importance upwards is more likely to make a (justifiable) positive impression than the alternative case which involves someone having to eventually update their estimate of your importance downwards. It's like the inverse of "don't throw pearls before swine". (I'm drunk, I apologize if I'm stating the obvious.))
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.