Courtesy of A Grand Event

Yes - Everyone regardless of budget should seek a wedding planner.  
Ask your self some important questions.
1. Would you perform surgery on yourself?
2. Would you represent yourself in court?

As strange as it may seem to compare a wedding planner to a doctor or a lawyer, the premise is pretty much the same.  A wedding planner can protect you from hiring a company that may not be as professional as they claim to be.  A wedding planner can save money for the bride and groom by referring the couple to vendors that the wedding planner is familiar with and has worked with several times in the past, and in most cases that vendor will offer the planner's clients a reduced rate for using their services that the vendor may not have otherwise offered you. 

 
For Example:
A couple contacts ABC DJ's and their regular price is $650.00, in most cases your wedding planner can get the exact same services from ABC DJ's for $550.00.  Coupled with the fact that the planner knows from experience which DJ's in that company are the best, and will insist that one of those particular entertainers handle's your event themselves personally.

Advantage:
You now have a very capable entertainer and you saved $100.00 (not bad huh)
There are generally two ways you can go with a wedding planner, you may hire them to help you every step of the way from your flowers to your fingernail polish (approx.$2500), or you may only hire them to help with vendor selection and to coordinate your wedding on site (approx. $700).  Either way the savings that you receive in most cases will out way the cost of the planner's service, in addition you have a professional you can depend on to answer your important questions.