Wedding photographer costs also vary based on the location of your wedding and this is easy to understand why.
For example, if you are planning to get married in Italy, you have probably googled and discovered the best Italian wedding venue on articles written by the most famous magazines and blogs, like The Condé Nast Traveler -
"The Best Wedding Venues in Italy, Whether You're Inviting 80 Guests or 250". You can suppose that the best wedding photographers will propose their services in the same range prices, as the service offered by the photographer must be up to the standards of a 5-star hotel.
Also, if you're planning a small elopement ceremony for two at Lake Como, the rates will not be the same as for a wedding with 300+ guests, where a larger team of photographers and videographers will be needed to cover an event of that scale. Especially since more preparation will be required beforehand with the wedding planner.