A lot of people have contributed to our budget, and not every one of them can attend any one single event.  Each event should be self-funded so we at the worst scenario, break even.
If a location is charging us a set amount to visit, we will divide that amount up by the number of people who are attending, add a small amount to cover PayPal fees, and possibly a tip for the event organizer who is doing the work to provide the photography experience.