At that price point, the better shops have demo bikes they will let you take out for the day, or they just let you test ride the new one and deal with a mark down if it looks worn after too many test rides.

If you're spending that much, you are likely to know what you're after and the approximate locations you want for your saddle and bars. The last person I knew spending that much took a Moots and then a Serotta out for a 50 mile ride in the Santa Monica. Both shops were experienced in how to sell high end bikes.

I don't expect that treatment because I can only dream of that much, but a local shop was willing to let me swap stems and pedals to test ride a $1100 around the block for as long as I liked. I mostly took measurements and then found a clean shop window to check my side profile, and made sure it shifted correctly before buying it.

edit: That being said, it also helps to have an already established relationship with the shop. If not, they don't know if you're a lookey-loo or someone who is seriously going to buy a bike, and sometimes they don't want to take the risk.