I like this idea. The anecdotal evidence from LAX above points to it already happening in an unsupported manner. If it was supported in the app and all driver

I like this idea. The anecdotal evidence from LAX above points to it already happening in an unsupported manner. If it was supported in the app and all drivers / passengers had visibility it would be a very clear market indicator for both the drivers and passengers. Cartel behaviour could be problematic though.