Did some quick maths
Credit.fr sold for $850,000
France
Exact = 74,000 ($11.48/visit)
Broadmatch = 37,200,000 ($0.02/visit)
Aus
Exact = 1,300 ($11.48 x 1,300 = $14,924)
Broad = 1,500,000 ($0.02 x 1,500,000 = $30,000)
Therefore based on cost per visitor ranges between $15,000 and $35,000.
I think the upper end of this price is fair but once you start pushing over $50k your in lala land.
will be interesting to see what it goes for.