Speaking with my marketing 'guru' hat on....I would imagine that advertisers would tear limb from limb to be able to advertise on PPRuNe!
Why?
Pilots are affluent (comparitavely), well-educated - what the statisticians call AB standard people - just look at the range of people and specialisms on Jet Blast.
I would imagine high quality companies such as BMW, Le Meridien et al would love to be able to so closely target such a high quality bunch of people.
Danny....take your figures together with some guff about how professional, intelligent, affluent pilots to such companies and I would hope you'll get a favourable response.