If you're going to open carry, seriously consider using a retention holster and learning some retention techniques that work in concert with the holster you choose.
Besides the fact that guns are expensive and nobody wants to lose one, there are other seriously negative factors involved. The two that come to mind first are the immediate danger that the newly armed criminal poses to you and the potential uses that the stolen gun will be put to by the criminal who takes it or those the criminal passes it to.