Did Voters Find 'Posh Boys' Too Lightweight?

I have my own theory as to why neither David Cameron nor Nick Clegg did as well as expected. In my experience as a the owner of a shop Your Life Your Style, the recession has caused people to become more cautious in their buying, preferring nostalgia, simplicity and lasting quality.
If you apply this to the party leaders you can see why voters might have been worried that Cameron and Clegg were too young and inexperienced to handle the current grave situation. Brown, despite his many failings, is stolid and experienced. The 'posh boys' might have been the right choice when the living was easy but to take on the worst crisis in most of our lifetimes, the Tories and Lib Dems might have been better with old warhorses like Ken Clarke and Vince Cable.