Why do you need picture upfront??

So often, I come across netizens who ask for a pic before any sort of acquaintance is made. I find this strange and somwhat annoying.Why do we give so much importance to looks?

I admit looks are important and one has to like what one see, if the relationship has to bee strong.But, is looks the most important factor? I dont think so.And, it is actually not safe to share pics with a person whom you have just met over the internet.One has to try and understand what lies beneath,no naughty thoughts pls...., and communication through words is the most needed medium.For me, looks are secondary.I have often come across dashing, model like material which does not offer much in terms of emotional substance.