A very sore subject with me, as I've been shooting and selling images with my work for a lot of years (As a journalist)
Was involved in a college sport (ten teams) ... Volunteered my images for ten years for yearbooks and calendars, etc. All proceeds went toward league expenses. I also gave parents/family 8x10 prints free. The league sold books etc, fund raising for the non-profit.
After ten years of "freebies" the league somehow became involved with a 'for profit' photograph agency (Who actually tried to hire me - and I declined). I continued shooting images and handing them out. The league told me to stop. (I'd guess the photographer complained) ... So, I then sent the league a copy of my press pass ... told the front office that the Supreme Court makes decisions about these freedoms, and they had no authority to stop me. Then, continued my 'freebies' ... I never heard another word about 'cease and desist' from anyone. And continued giving freebies.
Am I upset when parents or tourists or others take digital photos and give them to magazines, or sell them for peanuts. (This behavior emerged out of the ability to digital shoot, and would never have happened without digital) But, yes ... absolutely. What say do I have in it? None ... that may be unfortunate for my work, but we live in a free country and to undermine a parent or uncle or aunt the right to shoot images of anything is beyond me. The 'commercial police' here we find in copyright laws, and not in subverting the right to capture an image - that's history - journalist capture and document history each time we shoot an image, so does a parent.
What do we do to combat the idea that individuals undermine our ability to shoot and sell images ?? Well, we shoot images that no one else can shoot - That comes from our abilities as professionals, and that's the difference ... No one can challenge those images, not one can capture that moment, so, in effect, it overcomes the ability of individuals to compete at that level.
IF it would have been me and that league told me to stop - I would have absolutely forced them to allow the courts to decide that issue ... and not someone who sits at a table, drinking coffee and puffing out the chest, giving orders they have no right to give.