Unless these camera geeks are also software developers that actively follow open-source projects, I doubt they actually care. The intersection between those two

Unless these camera geeks are also software developers that actively follow open-source projects, I doubt they actually care. The intersection between those two groups, multiplied by the very slight amount of trust that is gained (teyc was right in that users don't care about your code, they care about other users), while non-zero, is not substantial enough to warrant open-sourcing and all the hurdles that come with it.