I reckon saddles are something you have to test to see if they work -- my LBS gives you a week to change your mind, but some give longer. But if I were Nashbar I think I would be a little peeved if a customer bought 5 saddles in one go and returned four of them four weeks later. It would make me think that customer has been puttting them on and off a bike like trying on shoes or something. Ethically it somehow seems logical to me to buy one, try that one out and only return it if it doesn't work. It will take longer, but it somehow makes more sense. And you might even luck out and find that the first one you buy is the dream saddle and you don't need to look any further.
__________________
Zero gallons to the mile