When people ask about the price of my gear, it's my choice whether to tell them or not. Frankly, it's none of their business. My friends have their own hobbies, and they have a lot of nice things too, and I'd never ask how much so and so's mountain bike or designer handbag costs.
When I do tell them, people are often astonished, but it's just how much you love something. Music keeps me going every day. I just got back from a long day at work, and a good song (Marvelous by Dragonette) is already cheering me up.
I'm happy with my hobby; I find it to be an excellent bridging of art and science. There's art in evaluating music, exploring new artists and genres, and discovering what sound you are looking for. The science, is building up such a knowledge of electronics and audio engineering, so that you can obtain that sound.
Also, I don't know why some audiophiles are so flabbergasted that some people can't appreciate their hobby. Maybe they just don't like music. Some people are going to be less open minded than others, and some people may be more arrogant or vocal about what they think of your spending. That's just their loss. I wouldn't bother trying to convert anyone, as, if they love music enough, they will just find their way here anyways.