If you're holding this at your church maybe someone there has had a raffle in the past and can give you guidance on what has worked best for them. If you're selling to the public......$5 to support something which they know nothing of would probably be too high, where as to those in your church in might not be. If you have a cause people support they are more willing to pay a little extra just to help out. If they don't support it you would be lucky to even get a dollar from some especially in today's economy.