Linked from the blog of the always excellent Harald Welte is this LIMO paper on the economic value of merging back changes to an open source project.
Quoting from there:
Currently, GStreamer comprises some 911,000 SLOC. Using our $50/SLOC factor, this equates
to an equivalent engineering cost of $45.5 million to develop this technology from scratch.
HFSNW! Surely at least $100K of that is my work. Where is my money?