Installerless installation on OSX?

[Graham Samuel]

I want to distribute a structurally simple RR-developed application  
to Mac OSX users (it's the standalone itself and a couple of sample  
folders). In testing, all I've done is to copy the app (which we all  
know is really a folder) to somewhere convenient on the user's hard  
disk. The user then double-clicks and that's it. Is there anything  
wrong with this strategy? Why do people have installers and .dmg  
files if so? I sense that one reason might be that the machine  
potentially has many users, all but one of whom won't have  
administrator privileges - as I'm not in this situation myself, I  
don't really know.

I want the simplest possible strategy for distribution. Any advice  
will be gratefully received, as ever.

Graham

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Graham Samuel / The Living Fossil Co. / UK and France