[g_lined]

It is increasingly trivial to try millions or billions of hashes per second. Using scrypt forces the computer to use more resources (in this case, memory in particular) which means that scaling the guess rate is orders of magnitude slower and cannot be significantly increased by building faster computers (because it's limited by memory not process speed).

http://en.wikipedia.org/wiki/Scrypt

It comes down to this: Why use something which is designed for speed like hashes to do something that can be broken by highspeed guessing?

[chongli]

>Why use something which is designed for speed like hashes to do something that can be broken by highspeed guessing?

Perhaps you have hundreds of millions of users? The slower your hash algorithm the more resources it takes to run it.

[jlgreco]

At hundreds of millions of users, I rather suspect resources spent on password hashing are going to be low on the list of concerns.