" "People think Congress has all these resources and staff. In fact Congress hasn't increased its resources since 1974, and the House of Representatives cut its budget by 20 percent since 2011 for each Member office."
From Congressional Management Foundation
Part of the problem is the (mostly Republican) Congressional desire to be seen as responsible trustees of the taxpayers' dollar. The one thing they can control is the staff and their salaries. And then they complain about lobbyists and the power of the bureaucracy.