Vovix said:
I would like to try it first before paying money,
As has been pointed out, there's no such thing as a free lunch.
Basically, it costs each chapter about $40 to have an NPC show up to an event. ($20 in site fees alone, plus food for NPCs, plus royalties to the games owner, plus insurance, plus paper/ink/pens/other logistics, plus the budget for costuming/props/prosthetics/makeup/etc, plus everything else I'm forgetting off the top of my head). Different chapters budget in different ways, and the "Fee" associated with NPCing ends up being called different things. Seattle calls theirs a $10 per day fee for NPCs, so $20 for a weekend event. Oregon has a $10 food fee. San Fran doesn't charge their NPCs, but the cost for their PCs is much higher. I prefer to make PCing as affordable as possible, so Seattle's fee structure is set up differently. No matter which way a chapter does it, the chapter is soaking most of the cost for the NPCs to be there. Any money left over at the end of the event goes into reserving sites for future games, getting props together, etc. At the end of the day, no one actually makes any money, we're an entirely not-for-profit volunteer organization.
Before deciding not to play anywhere that won't give you a free game, consider that you'll probably spend at least $20 for the weekend for food, which both Oregon and Seattle will cover for you. Also keep in mind that most activities (like catching a movie or something) will cost you quite a bit more for the amount of time that it'll keep you entertained. At $20 for a whole weekend, you're looking at around the least expensive entertainment you can get.