If you want somewhere central then Alice Springs would have to be the most central location from a national point of view... but the Sunshine Coast is the centre of the known universe.
I don't know what the percentages would be... but the men in this site would by far outnumber the women... so even if a smaller amount of men put their pics up... it would still balance out.
Never hurts to look, but I'm not marketing myself... so I don't see a need to put a pic up.
RE: Dinner Date
Don't worry about the cost... blondie is paying!