Plex home members get access to all the apps for free. Maximum of 15 members per home share. So no, its definitely not cheaper and to Plex users looking to switch its a bit concerning to have a device limit.
I wasn't aware of the "home" feature. That must have been added after I left Plex.
I do wish that Emby would make the "devices" more transparent. Not everything counts against the limit, and you never know how many you have used or what they are. Improvements to that have been talked about, but so far, not much has been done towards that.