I agree, 100 dollars is definitely justifiable and I would go so far as to say that 100 dollars is a joke compared to prices over here. Sadly it is hard to audition iems so you have to listen to other people's opinions, read reviews, etc. There are a couple of bad reviews about the SE530 and a ton of very positive ones.
It's sick that Q-Jays cost so much over there. They are "cheap" here in Sweden in comparison to other headphones and iems.
2 x Q-Jays = 1 HD650
3 x Q-Jays = 1 SE530, or 1 AKG701
I had another reason for buying the SE530. It means I get to own something that none of my friends have (or probably will ever have). But that's just me.
Sometimes Q-Jays are better than SE530.
Most of the time SE530 is better than Q-Jays provided you can EQ or provided you have a "forward" sounding device.
Of course it's down to personal taste and people wanting to justify the fact that they spent a ton of money on iems.
After buying the SE530 I actually felt free as far as iems go. I've reached the top when it comes to universal fit IEMs for portable unamped use! And for only 500 of your US dollars! I got 100 dollars off!
But I might just buy the Q-Jays anyway!
Other things I could do with the money instead of buying Q-Jays:
Have 4 dinners out.
Buy 25 packs of cigarettes.
Buy food for 2 weeks.
Eat 20 Big Mac & Co or 20 pizzas, kebabs, whatever.
Buy 2 or 3 Xbox 360 games.
I also don't know what kind of salaries you have in the US so it's hard for me to say.