Every AD is different. Some may love the idea of having you in and getting to know you so they can sell you other watches. They'll make sure you have a great experience. Others may have a set price to inspect a watch...where others may not be willing to do it at all.
My feeling, for what it's worth, is just to be 100% honest about what you're goal is and ask for their help. People generally like to help. Sharing that you're willing to pay for their time and get to know their store in the process will likely give you the best chance of a successful outcome.