My guess would be attention and publicity. Targeting a technical, developer centered site is likely to require more "skill" as one would expect such a site to h

My guess would be attention and publicity. Targeting a technical, developer centered site is likely to require more "skill" as one would expect such a site to have their defenses ready for this. All the greater challenge. Secondly, every time this happens it causes quite a discussion on developer forums and sites such as HN. If you're seeking attention and "recognition" amongst technical people, what better site to attack?