Trying before buying

I don't understand the concept of an arranged marriage. I mean, you meet the guy once or twice and decide that you want to spend the rest of your life with him? Look at it this way, when you go shopping for a dress, you don't just buy the first thing you see, right? You check how it fits, whether it is comfortable, whether you have accessories that go with it, how many occasions you can wear it for. You parade around in it to see if you make a statement, whether the outfit is 'YOU'. So much fuss for a dress and just one encounter is enough to make one of the most important decisions of your life? You have to try before you buy, right? You could argue that the parents have probably checked out his background, but they can't really check out his personality can they? Just because you seem compatible on paper doesn't mean that you're compatible in real life. I mean, the parents can introduce the guy to you, and you can date him for a while. Get comfortable with each other and decide whether you are right for each other. Honestly, this is a person you expect to spend the rest of your life with, it's not a spontaneous, spur of the moment decision you just jump into. It may sound insanely romantic, but it's just insane.