Getting back to reality and leaving fantasy behind...

As others have said: Lock the gate and post signs.

One club that I know of posts an additional informational sign listing the amount of money that their field costs them to maintain each year: lease, mowing, fertilizer, water, shelter, maintainence, paving etc and invites any non member visitors to join the club and help keep the cost of flying at the field as low as possible.

Our semi public field has two signs: "This field leased and maintained by the Fort worth Thunderbirds" Next to that one is another: "Are you a Thunderbird? If not, you OUGHT to be!"

We also give members tiny Thunderbird stickers for their AMA card. That way, you can tell at the frequency board who is a member and who might not be (We do have a generic freq board area for those on 2.4, although the frequency board is not as useful as it used to be!)

Even though it does not reach everyone and some will never join, it is best to take the high road and for the club to be approachable and friendly. As the old saying goes, you get more flies with honey than with vinegar...