(sorry to bombard everybody with so many questions)

When you're test riding and the LBS starts swapping out stems and such to get a better fit for you, does that mean the price is going up for the new parts?

If you get a great fit but it's because they had to do a lot of swapping out of parts, does that mean you should probably keep testing before you buy, in case you find a bike that fits better without all the extra modifications (but come back to the great fit if necessary)?

I'm trying to figure out how things are done, before I get into the marketplace.