Don't forget that a particular code might have 2 or 3 paper's worth in it, so releasing the code after 1 paper could mean getting "scooped" on another paper.

I'm left a little cynical after a Master's in computational science, and I still can't believe that open code is not part of the repeatability doctrine. I suppose my goals are not aligned with most grad students since I have no interest in an academic career (at least not after many years in industry) but I got much more satisfaction from feedback on my blog posts than publication.

Hell, each blog post is its own little publication, and it may not be peer reviewed before its published, but the amount of links to them and google searches prove that I have more than a few peers who appreciate my contributions.