Pretty much everywhere I've ever gamed has charged something for tables. I'm usually pretty involved in the local stores, its a social event for sure, so I have no problem at all paying a few bucks to help support the store. Especially because warhammer groups can often take up a fair bit of space.
Some places are more then others. I think my current space is like 5 bucks to have a table all day (Unless there's an event planned), and it goes to the store. They also have a board game library, and thats $15 per person to use whatever you want all day. That goes on a gift card though and goes back to you. Which is a nice little bonus imo.