As others have said, your best bet to get things going is to offer small change for free so that folks will try it out.  I know that I won't deposit my own money in a new site until I've had a chance to see that things are fair, acceptable, fun, etc.  On the other hand, sites that offer small faucets for me to try have often gotten me quite hooked and I end up playing with my own money once I trust them.