affordable bridesmaid wears for wedding party

As we all know, weddings are no cheap affair...and not just for the bride and groom -
Apparently the average amount guests will spend (once you include travel costs, hotel, new suit/dress, gift...) is $600! affordable bridesmaid wears for wedding party
They better stay together for that kind of money :)
So, what about you, does that number seem too high, too low, or just about right? ~mars