From I Want Media (31-Aug-2006):
"A big obstacle towards more rapid growth in online advertising is the lack of experienced staff, according to media execs. The dearth of talent is said to be limiting the pace at which marketers can shift money from traditional media to hot Web properties like MySpace and YouTube ..."
pointing to an FT.com article from Aline van Duyn
From my own experience, talking to advertising staff in publishing houses responsible for online advertising, I must say: the majority of ad sales consultant does not no what they are doing and/or what their clients (and publisher) want them to achieve (nor do publisher spend money to train them).