Successful game inventors know that they cannot fall in love with their game idea.  Just because you like it, doesn't mean everyone else (or anyone else) will.  Of course, one of the issues with this is that even if you are willing to be flexible, you generally don't get endless chances.  Some have suggested that you get only one, maybe two changes at tinkering with your game before you're likely going to have to abandon it.  This applies to a game that has been placed in a casino and not necessarily one in the process of being showcased.