Some of the things just said are important and true, but,
Do you realize, (have they explained it to you) that you are paying them to lock in a rate?
I am not a fan of locking the rate, especially when the rates are as flat as they have been.
And they are charging you to do that; probably about $400-$500!!
You do realize that?
And what rate are they locking? Is it a low rate? A great rate?
What does your GFE say?
The Good Faith Estimate is required by Federal Law and shows every fee and charge, along with the Interest Rate and the APR.
Where is your Buyer's Agent while all this is going on?