The truth and nothing else but the truth.
I was an Army photographer - I love taking photographs.
I attended my first Airsoft game last year (Combat South Charity Event) and offered all the photographs to the organisers for free, to do what ever they wanted with them. A lot of players asked if they could get copies of the photographs so I pointed them to my Facebook page where they can copy them as much as they like, some of the players emailed me to say that the print quality wasn't very good. (web images are only 72 DPI and print images are 300 DPI) so I set up the SmugMug site so they can buy them.
I am a professional photographer with overheads, fuel, insurance, web hosting let alone the cost of the gear.