[TazeTSchnitzel]

I don't think developers do either. Apple prompting you when you run an untrusted app for the first time is almost certainly a good thing (app replaced with a malicious one? you'll get an unexpected prompt), and it hurts nobody.

[kstenerud]

If someone has the power to replace an installed app on my machine, it's already game over.

[TazeTSchnitzel]

How so? On OS X that doesn't require admin rights.