Why should I contribute to an open source project when I can do something like design a simple killer wordpress theme that may gain major adoption and use that as reference for my work than a single open source project catered to a single developers open source work that may or may not get used heavily. That or is only used in parts. There are tons of free designs out there, how often have you or anyone you know hiring designers reference how awesome or widely adopted their one off icon kit has been or something similar? Not happening.