To correct part of your system any, she offered you a 10% discount to close on the deal then and there. An incentive technique to save them, and you, both time and money of a return sales call.
And the reason for the 3" binder is to instill confidence via testimony from hundreds of other local, satisfied customers. Most homeowners have very little knowledge of the remodel process and products so it is the sales representative's job to educate the buyer in order for them to make an informed decision. Getting multiple quotes is always a good idea so that you can compare apples to apples.
You also learn the different processes employed by both companies as well as their products. The average bath remodel cost from $4,000 to $7,000 so knowledge is your best decision tool.