I'm a new racer.
The first time I got an envelope full of photos I didn't order I dutifully put them in an envelope and mailed them back at my own expense with a very polite letter saying I was not interested and if they wanted my business in the future please send me digital proofs or post them on a website. I would be interested in buying under those provisions as the guy is a pretty darn good photographer.
Sure enough I got several more envelopes of hard photos after the next few races.
Now I don't send them back, don't reply, I just keep the pictures in a pile as a free gift and throw the subsequent harassing invoices in the garbage.
I told him very politely how to get my business and it was ignored.
Now I just keep the photos as a free post race gift until they step into the 21st century.