My 2012 Leaf takes 3 hours to fully charge on a L2 charger, and that gets me 35-40 miles range. $9 for 35-40 miles. My Camaro gets 20 miles to the gallon, it's significantly cheaper to put gas in the 320HP Camaro than pay this kind of rate for charging.
With that exact example of $3/hr, yes it's more expensive to use p2p charging than driving your Camaro. There are hosts that offer cheaper or free charging. The $3/hr is an example based on public charging rate in the Bay Area. Another case is if the host happen to be in a highly visited location and charge $10/hr for charging and parking.
EVs are still overall a bit more expensive than gas cars. That's why there are still subsidies. In the bigger picture, it's still paramount we switch to a cleaner and more sustainable energy source, and electrifying transportation is an inevitable step. I'm confident the technology will mature and will mature fast.