Doctors, mechanics, lawyers, videographers… whatever profession you care to mention, experience and expertise matters more than any other factor and, all things being equal, you do tend to get what you pay for. There are many, many moving parts in the creation of a video but at the end of the day you are paying for the expertise and experience of the key people responsible for your video.
Costs: You can pay $25/hour for a recent film school graduate or $250/hour or more for a top-flight video veteran. On average most production companies will charge between $75/hour and $150/hour for the people involved in key activities such as shooting, editing and directing a corporate video. (TV commercials are an exception where A-list professionals can be an order of magnitude more expensive depending on the budget.)