Interesting discussion, on the 'purpose that is beneficial' point I wonder how that has changed, or how it might change in future, particularly for those well connected on social media but without links to traditional print media or well established websites.
As an example, I attended an action day (glorified track day with about 1500 cars in attendance) recently, within 3 days my gallery stats were sitting somewhere around 50,000 views despite only posting a link on one forum and Facebook myself (and I'm far from being well connected). Looking at the stats, it led me to loads of forums where the photos were shared/linked to, and plenty of 'ooooh I'm definitely attending next time' type comments. They probably reached more unique individuals than if I had managed to arrange a short article/image in my local paper, and were focused on exactly the sort of people the event is trying to attract.
I don't want to be trackside, but I imagine I could put a pretty strong case to the promoter based on the internet traffic/social media discussion etc that my photos generated, that even though I'm not working for a company/newspaper/website, I could bring a lot of awareness to their event in future. Whether there would be much (or any) money in it is obviously another issue entirely.