If you've got an HPWC, you will definitely not get anybody other than Model S owners asking to use your charger - and fast-amp HPWCs are what people want to see most, so that works out well for everybody.
I've got a couple of 14-50 outlets, so I've had mine listed on plugshare for 2-3 years. I'd be happy to let any EV owner use them if they need it, but nobody has ever called. Of course it depends on the speed of your outlet as well as your location...there is a fair amount of infrastructure near me.
There are some other charging apps with some better features, but I like plugshare because they list all of the public chargers (or at least as many as they know about; no database has everything, but if you see something missing you can add it) AND give you the option of looking at private chargers. So far I've not used one either, but it's nice to know the option is there for when you really need it.