Q. Weddings are very expensive, do we really need to feed the vendors?
A. The simple answer is yes. The photographer, videographer, band, and planner have been working several hours for you without a break, so not only is it a nice gesture it will actually be in their contract. Make sure you discuss this with them before.
You are not obligated however to serve them alcohol. Some venues and caterers might even give you a discounted rate as they might not serve the vendors the exact meal the guests will be having.