Hierarchies are expensive to maintain. The Obama campaign has twice the staff at the same cost as Romney's campaign. Many people who support Romney are used to being paid very well, so it would make sense that he has to pay much more to get people to work for him.
Here's another example that the people who support Obama, the "47%" (who Romney calls victims and who expect the government will give them entitlements) will work hard at the same job for significantly less money than the people who work for Romney. The comparison of salaries in the two campaigns show us the Romney's workers feel entitled to much more compensation for the same work.
http://www.latimes.com/news/politics/la-pn-obama-romney-staff-expense-20120924,0,2707799.story
