[mxcl]

Personally there were two reasons:

1) I don't want bandwidth costs

2) It's much harder to get contribution for a binary system (I expect). If you're installing foo and it doesn't work for some reason you probably won't want to install Xcode and Homebrew-dev in order to try and fix it. When you're installing from source you're already a `brew edit foo && git push` away from helping fix it.

It's also worth noting that most packages don't have dependencies in Homebrew. This is because we don't duplicate what is already there and OS X comes with quite a lot of the common low level libraries. So compiling foo takes significantly less time than it does with Macports.