Secret to getting Hotel Rooms cheaper!

I like to think I know a lot about getting inexpensive hotel rooms when traveling, I've stayed in many many hotels over the years between traveling for work and traveling for pleasure but this is one I had never thought of. I found this tip in an article I was reading and I thought it was genius, to get the best deal on a hotel room instead of calling the 800 number or calling the hotel and asking for the reservation line, ask to speak to the manager in charge and try to negotiate the best deal. If it's a large hotel chain the manager may just pass you back to room reservations but if it's a smaller chain or independent the manager may be willing to work out a deal with you, especially if there are a lot of rooms available. Anybody out there in the hotel business, does this work, is it worth trying?