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I have a friend that has an insurance agency and he is hounded by sales people asking him to advertise on their websites... all of them quote him out of this world traffic statistcs. Is there anyway to prove it?
Screen shots of traffic can be fakes, and if you really want to go through the trouble you can fake a login and give access to fake stats.
Alexa rankings will give some indication of where those sites actually stand.
If you are going to use Alexa as "proof" of traffic, you want to research how you can "massage" their figures.
WHilst some people seem to believe Alexa results, then can easily be manipulated.
Are they looking for flat rates, CPC or CPM deals? Could do something small on performance or a short term CMP/CPC deal and see if it converts at all.