I would also argue that possibly doing it per time may be the wrong incentives.
I have had issues that took me several hours to try to debug, only to have someone else show me how to fix it in under 2 minutes. So that dev gets paid $1, but I would easily pay much more for the fix in that issue because of how much time I sunk in it.
I have had issues that took me several hours to try to debug, only to have someone else show me how to fix it in under 2 minutes. So that dev gets paid $1, but I would easily pay much more for the fix in that issue because of how much time I sunk in it.