You would have to have alot at that field in terms of Variety. I run a field myself, I also don't charge for games unless there are costs involved like props, food, etc. The other main field we play at that is larger has just as much setup as mine and follows the same idea. We are players not out to make money so we dont generally charge like I said unless there are personnal costs since I'm not made of cash.
So If you are thinking of making a field and charging cash even if its just abit you better have alot to offer. Also neither of the most popular fields are more than an hour away so better get something close, not giving more specific than that I dont like posting info on this site otherwise.
Also as was posted before, signup for our boards and try to get to know the people you are thinking of getting cash from. Generally we might actually care that way.